Data transmission method, device, and storage medium

Abstract

The present application provides a data transmission method, a device, and a storage medium. The data transmission method applied to a first communication node comprises: receiving a preamble sent by a second communication node, wherein the preamble comprises a transmission start indicator part; and receiving data on the basis of the preamble.

Description

Data transmission methods, devices and storage media Technical Field

[0001] This application relates to the field of communication technology, specifically to a data transmission method, device, and storage medium. Background Technology

[0002] In the field of wireless communication, the Internet of Things (IoT) can connect multiple things to improve productivity or enhance quality of life. Because IoT applications require the deployment of hundreds of millions of devices, these devices must be small in size, low in complexity, and low in power consumption.

[0003] Due to the low-complexity design requirements of IoT devices, some IoT devices lack energy storage. Therefore, these devices need to obtain energy from the surrounding environment (e.g., high levels of downlink signaling) and transmit uplink signals via backscattering. IoT devices have poor synchronization with base stations, but IoT scenarios still require certain coverage. Therefore, their data transmission needs to be designed to meet the application requirements of low-complexity systems. Summary of the Invention

[0004] In view of this, embodiments of this application provide a data transmission method, device, and storage medium that can effectively detect downlink data transmission.

[0005] This application provides a data transmission method applied to a first communication node, comprising: receiving a preamble sent by a second communication node; wherein the preamble includes a transmission start indication portion; and receiving data based on the preamble.

[0006] This application provides a data transmission method applied to a second communication node, comprising: sending a preamble to a first communication node so that the first communication node receives data based on the preamble; wherein the preamble includes a transmission start indication portion.

[0007] This application provides a data transmission device applied to a first communication node, comprising: a receiving module configured to receive a preamble sent by a second communication node; wherein the preamble includes a transmission start indication portion; and a transmission module configured to receive data based on the preamble.

[0008] This application provides a data transmission apparatus applied to a second communication node, comprising: a sending module configured to send a preamble to a first communication node so that the first communication node receives data based on the preamble; wherein the preamble includes a transmission start indication portion.

[0009] This application provides a communication device, including: a memory and one or more processors; the memory is configured to store one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the data transmission method described in any of the above embodiments.

[0010] This application provides a storage medium storing a computer program, which, when executed by a processor, implements the data transmission method described in any of the above embodiments. Attached Figure Description

[0011] Figure 1 is a flowchart of a data transmission method provided in an embodiment of this application;

[0012] Figure 2 is a flowchart of another data transmission method provided in an embodiment of this application;

[0013] Figure 3 is a structural block diagram of a data transmission device provided in an embodiment of this application;

[0014] Figure 4 is a structural block diagram of another data transmission device provided in an embodiment of this application;

[0015] Figure 5 is a schematic diagram of the structure of a communication device provided in an embodiment of this application. Detailed Implementation

[0016] Since IoT devices are generally passive (without batteries), their signaling design and transmission differ from those of active terminals such as mobile phones.

[0017] For passive IoT devices, the base station (or excitation source or reader) needs to continuously send high-level signals to power or activate / charge the IoT device. After the IoT device is activated, it receives downlink signaling sent by the base station and returns uplink signaling to the base station via backscatter.

[0018] In A-IoT (Ambient-IoT) communication scenarios, the device that communicates with A-IoT devices can be called a reader. The reader can be a base station or User Equipment (UE). The UE can be a mobile phone or other 5G terminal device.

[0019] In A-IoT communication scenarios, due to the simplicity of A-IoT devices, it is impossible to continuously maintain synchronization between A-IoT devices and readers. Therefore, a preamble sequence may need to be sent for synchronization before each uplink / downlink communication.

[0020] Downlink signaling can be used to send pilot sequences (preamble sequences), and / or control information, and / or downlink data to IoT devices. The IoT devices, based on the received signaling, return corresponding data or feedback information uplink. For example, downlink signaling might include a read command and the read location (content). The IoT device retrieves the data at the indicated location and sends it to the base station. Alternatively, downlink signaling might include a write command, the write location, and the data to be written. Upon receiving the signaling, the IoT device stores the downlink data at the indicated location. Typically, a downlink signaling sequence contains pilot signals and data (data is sent after the pilot signal), or it may contain pilot signals, control information, and data (control information follows the pilot signal, and data follows the control information). A single downlink transmission can include a preamble, and / or control information, and / or data.

[0021] For downlink transmission, the preamble has two functions: first, it indicates the start of downlink (reader-to-device: R2D) transmission; second, it indicates the R2D chip length. The chip is the basic unit of downlink transmission. The first functional part can be called the Start Indicator Part (SIP), and the second functional part can be called the Clock Acquisition Part (CAP), or chip length indicator. The SIP precedes the CAP.

[0022] For uplink (D2R, device to reader), the preamble is used to determine the start of the uplink transmission or for synchronization. The midamble or postamble is used for demodulating the uplink data.

[0023] Ambient IoT uses a 5G NR system and employs OOK4 or OOK1 modulation for downlink (R2D) transmission. OOK4 means one Orthogonal Frequency Division Multiplexing (OFDM) symbol carries M chips, while OOK1 means one OFDM symbol carries one chip. Before receiving the preamble, the device does not know when a downlink transmission will occur, nor does it know the length of a single chip (different M values ​​correspond to different chip lengths, with multiple candidate M values). Therefore, it needs to detect the preamble to make this determination. OOK stands for On-Off Keying. In a single downlink transmission, the M value for the data portion is fixed (one of multiple candidate M values).

[0024] In an A-IoT system, the time unit / resource unit for downlink / uplink transmission can be a chip, with each encoded bit corresponding to one chip. Bit 0 corresponds to a low level of one chip, and bit 1 corresponds to a high level of one chip. In some embodiments, the preamble does not require encoding, and each bit corresponds to one chip. In some embodiments, an OOK 0 corresponds to a low level of one chip, and an OOK 1 corresponds to a high level of one chip. In some embodiments, a BPSK-1 corresponds to a low level of one chip, and a BPSK 1 corresponds to a high level of one chip.

[0025] Since the start indication section signals the beginning of downlink transmission, it needs to be easily detectable and preferably distinguishable from subsequent downlink transmissions to prevent IoT devices from mistaking the data portion of the downlink transmission for the start indication section. During downlink transmission, the reader sends an On-Off Keying (OOK) signal. To facilitate device identification and differentiation between high and low levels, the transmission power of the high-level signals in the OOK signal should remain consistent. Because the total power of the reader transmitting a single Orthogonal Frequency Division Multiplexing (OFDM) symbol remains constant, the power of the high-level chips in each OFDM symbol is determined by dividing the total power of the symbol by the number of high-level chips in that symbol. Therefore, if the number of high-level chips in each OFDM symbol is the same, the transmission power of each high-level chip will be the same during downlink transmission. In this application, a preamble design scheme is designed to include the same number of high-level chips in each OFDM symbol during downlink transmission to improve the device's detection performance for downlink transmissions.

[0026] In one embodiment, FIG1 is a flowchart of a data transmission method provided by an embodiment of this application. Exemplarily, for downlink (R2D) transmission, this embodiment can be performed by a first communication node. Exemplarily, for downlink (R2D) transmission, the first communication node may include: IoT devices such as tags, electronic tags, Ambient-IoT terminals, ordinary terminals, low-cost terminals, etc. Exemplarily, the second communication node may include: a base station, a reader / writer, a terminal, etc. As shown in FIG1, this embodiment includes: S110-S120.

[0027] S110, Receive the preamble sent by the second communication node; wherein the preamble includes a transmission start indication part.

[0028] In one example, the start-of-transmission (NOT) indication portion refers to the position that can be used to indicate the start of downlink transmission. In one example, the NOT may include multiple high / low level transmissions (e.g., 111110100000 contains two high / low level transmissions, and 111000 contains one high / low level transmission). In one example, the NOT includes multiple high / low level transmissions, and the number of high-level chips in the NOT is the same as the number of low-level chips. For example, the NOT uses an M value of 12, and the sequence of the NOT includes one of the following: 110100, 111100110000, 111110100000. Each '1' represents a high level chip, and each '0' represents a low level chip. The duration of a chip is determined by the M value used in the NOT. For example, if the M value of the NOT is 12, the length of a chip is 1 / 12 of the OFDM symbol length. The relationship between the M value and a chip length is: chip length = 1 / M.

[0029] S120, Data reception based on preamble.

[0030] In one example, the second communication node sends a preamble containing a transmission start indication portion to the first communication node. The first communication node can determine the start position of the second communication node's downlink transmission based on the transmission start indication portion, thereby accurately detecting and receiving the relevant downlink transmission data from the second communication node. Furthermore, the first communication node can accurately detect and determine the high and low levels of the data portion based on the high and low levels of the transmission start indication portion, and receive the downlink transmission data from the second communication node. The high level refers to a high level corresponding to one or more consecutive chips, and the low level refers to a low level corresponding to one or more consecutive chips.

[0031] In some embodiments, the number of high-level chips in the start-of-transmission indication portion is less than the number of low-level chips. That is, the number of high-level chips in the start-of-transmission indication portion is less than half the total number of chips included in the start-of-transmission indication portion. When transmitting the start-of-transmission indication portion, the second communication node can adjust its transmission power so that the average power of the high-level chips in the start-of-transmission indication portion is equal to the average power of the high-level chips in the data transmission portion, thereby solving the problem of power imbalance.

[0032] In downlink transmission, the data portion uses Manchester encoding (bit 1 is encoded as bit '01', and bit 0 is encoded as bit '10'), and the M value (the number of chips contained in an OFDM symbol) of the data portion is an even number. Therefore, if an OFDM symbol contains only data, the number of high-level chips and the number of low-level chips in that OFDM symbol are the same. Having the same number of high-level chips and low-level chips in the start-of-transmission indication portion ensures that the power of the high-level transmissions in the start-of-transmission indication portion and the data portion is the same in the downlink. The first communication node can accurately detect and determine the high and low levels of the data portion based on the high and low levels of the start-of-transmission indication portion, and receive the downlink data transmitted by the second communication node.

[0033] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block. The first sub-block contains a number of high-level chips greater than or equal to the number of low-level chips. The second sub-block contains a number of high-level chips equal to the number of low-level chips in the first sub-block, and vice versa. Specifically, the first sub-block contains the same number of chips as the second sub-block. This design ensures that the number of high-level chips and the number of low-level chips in the transmission start indication portion are the same.

[0034] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block. The first sub-block contains a greater number of high-level chips than low-level chips, and the second sub-block contains a less number of high-level chips than low-level chips; or, the first sub-block contains an equal number of high-level chips and a equal number of low-level chips, and the second sub-block contains an equal number of high-level chips. In some embodiments, the first communication node has no power supply, and the first sub-block contains a greater number of high-level chips than low-level chips. This structure facilitates powering / wake-up of the first communication node, ensuring that the first communication node does not miss the detection of the transmission start indication portion.

[0035] In one example, both the first and second subblocks are 1 / 2 (0.5) OFDM symbol lengths, and the M value of the transmission start indication portion is 16. The first subblock is one of the following: 10000111, 10001110, 10010011, 10010101, 10010110, 10011001, 10011010, 10011100, 10100011, 10100110, 10101001, 10101010, 10101100, 10110001, 10110010, 10110100, 10111000, 11000101, 11000110, 11001001, 110 01010, 11001100, 11010001, 11010010, 11010100, 11011000, 11100001, 11100010, 11100100, 11101000, 11110000, 10001111, 10010111, 10011011, 10011110, 10100111, 10101011, 10101101, 10110110, 10110110 , 10111001, 10111010, 10111100, 11000111, 11001011, 11001101, 11001110, 11010011, 11010101, 11010110, 11011001, 11011010, 11100011, 11100101, 11100110, 11101010, 11101100, 11110001, 11110010, 1111 0100, 11111000, 11001111, 11010111, 11011101, 11011110, 11101011, 11101101, 11110011, 11110101, 11110110, 11111001, 11111010, 11111100, 10111111, 11011111, 11101111, 11110111, 11111101, 11111101, 11111110.The second sub-block is one of the following: 00011110, 00101110, 00110110, 00111010, 01001110, 01010110, 01011100, 01101010, 01101100, 01110010, 01110100, 01111000, 10001110, 10010110, 10011100, 10011100, 10100110, 10101010, 10101100, 10110010, 10110100, 101 11000, 11000110, 11001010, 11001100, 11010010, 11010100, 11011000, 11100010, 11100100, 11101000, 11110000, 00001110, 00010110, 00011010, 00100110, 00101010, 00101100, 00110010, 00110100, 00111000, 01000110, 01001010, 01001100 , 01010010, 01010100, 01011000, 01100010, 01100100, 01101000, 01110000, 10000110, 10001010, 10001100, 10010010, 10010100, 10100010, 10100100, 10101000, 10110000, 11000010, 1100010, 1100100, 11010000, 11100000, 00000110, 0000 1010, 00001100, 00010010, 00010100, 00100010, 00101000, 00110000, 01000100, 01001000, 01010000, 01100000, 10000010, 10000100, 10010000, 10100000, 11000000, 00000010, 00000100, 00001000, 00100000, 01000000, 10000000. For example, the transmission start indication part can be one of the following: 10001111 00001110, 11101111 00001000. The above sequences have a relatively small number of high-low level transitions, so the first communication node only needs to detect a small number of high-low level transitions to detect SIP, reducing the complexity of the first communication node.

[0036] In one example, the length of both the first and second sub-blocks is 1 / 2 (0.5) OFDM symbol length, and the M value of the transmission start indication portion is 12. The first sub-block is one of the following: 100011, 100101, 100110, 101001, 101010, 101100, 110001, 110010, 110100, 111000, 100111, 101011, 101110, 110101, 110110, 111001, 111010, 111100, 101111, 110111, 111011, 111101, 111110. The second sub-block is one of the following: 001110, 010110, 011010, 011100, 100110, 101010, 101100, 110010, 110100, 111000, 000110, 001010, 010100, 011000, 100010, 100100, 110000, 000010, 000100, 001000, 010000, 100000. For example, the transmission start indication portion is one of the following: 110001 001110, 110011 000110, 101111 000010, 101111 010000.

[0037] In one example, both the first and second subblocks are 1 / 2 (0.5) OFDM symbol lengths, and the M value of the transmission start indication portion is 8. The first subblock is one of the following: 1000, 1100, 1010, 1001, 1110, 1101, 1011. The second subblock is one of the following: 1110, 0111, 1101, 1011, 1100, 0101, 1010, 0011, 0001, 1000, 0100, 0010. For example, the transmission start indication portion is one of the following: 10001110, 1100 0011, 1100 0110, 1010 0011, 1000 0111, 1110 0001, 1110 1000, 1110 0100.

[0038] In one example, the length of the first and second sub-blocks is 1 / 2 (0.5) OFDM symbol length, and the M value of the transmission start indication part is 24. The first sub-block is one of the following: 110000001111, 110000011110, 110000111100, 11001111000, 11011110000, 111000000111, 111000001110, 11100001110, 111000111000, 11101110000, 11110000011, 111100000110, 111100000110, 11110000110, 11110001100, 11110011000, 11110 1100000, 111110000001, 111110000010, 111110000100, 111110001000, 111110010000, 111110100000, 11111100000, 100000111111, 1000011111100, 100111111000, 101111110000, 110000011111, 110000111110, 11001111100, 110111110000, 11100000 1111, 111000011110, 111000111100, 111001111000, 111011110000, 111100000111, 111100001110, 11110001110, 111100111000, 111101110000, 11111000011, 111110000110, 11111001100, 111110110000, 11111100001, 111111000010, 111111000100, 1111110010 00, 111111010000, 111111100000, 110000111111, 110001111110, 110011111100, 110111111000, 111000011111, 111000111110, 111001111100, 111011111000, 111100011110, 111100111100, 1111101111000, 111110000111, 111110001110, 111110011100, 111111000011,111111000110, 111111001100, 111111011000, 111111100001, 111111100010, 111111100100, 111111101000, 111111110000, 100011111111, 100111111110, 101111111100, 110001111111, 110111111100, 111000111111, 111 001111110, 111011111100, 111100011111, 111100111110, 111101111100, 111110001111, 111110011110, 1111110111100, 111111000111, 11111100111, 111111011100, 111111100011, 111111100110, 111111110001, 11111110001 110010, 111111110100, 111111111000, 101111111110, 110011111111, 110111111110, 111001111111, 111011111110, 111100111111, 111101111110, 11111100111, 1111111011110, 111111100111, 111111101110, 11111110 011, 111111110110, 111111111001, 111111111010, 111111111100, 101111111111, 11011111111, 111011111111, 111101111111, 111110111111, 111111011111, 1111111101111, 1111111110111, 111111111011, 111111111101, 111111111101. The second sub-block is one of the following: 000001111110, 000011111100, 001111110000, 011111100000, 100000111110, 100001111100, 100011111000, 100111110000, 101111100000, 110000011110, 110000111100, 110001111000, 110111100000, 111000001110.111000011100，111000111000，111001110000，111011100000，111100000110，111100001100，111100011000，111100110000，111101100000，111110000010，111110000100，111110001000，111110010000，111110100000，111111000000，000000111110，000001111100，000011111000，000111110000，001111100000，011111000000，100000011110，100000111100，100001111000，100011110000，100111100000，101111000000，110000001110，110000011100，110000111000，110001110000，110011100000，110111000000，111000000110，111000001100，111000011000，111000110000，111001100000，111011000000，111100000010，111100000100，111100001000，111100010000，111100100000，111101000000，111110000000，000000011110，000000111100，000001111000，000111100000，001111000000，011110000000，100000001110，100000011100，100000111000，100001110000，100011100000，100111000000，101110000000，110000000110，110000001100，110000011000，110000110000，110001100000，110011000000，110110000000，111000000010，111000000100，111000001000，111000010000，111000100000，111001000000，111010000000，111100000000，000000001110，000000011100，000000111000，000001110000, 000011100000, 000111000000, 001110000000, 011100000000, 100000000110, 100000001100, 10000001100, 100000110000, 100001100000, 100011000000, 100110000000, 101100000000, 11000000010, 110000000100, 110000001000, 11000001000, 110000100000, 110010000000, 110010000000, 110100000000, 111000000000, 000000000110, 000000001100, 000000011000, 000000110000, 000011000000, 000110000000, 001100000000, 011000000000, 100000000010, 100000000100, 100000001000, 100000010000, 100000100000, 100001000000, 100010000000, 100100000000, 101000000000, 110000000000.

[0039] In one example, the first sub-block of the transmission start indication portion precedes the second sub-block. In another example, the second sub-block of the transmission start indication portion precedes the first sub-block. For example, the transmission start indication portion is one of the following: 111110001100 111000001100, 111000001100111110001100, 111000000000 000111100000, 111110000000 110001111000.

[0040] In one example, both the first and second subblocks are 1 / 4 (0.25) OFDM symbol lengths, and the M value of the transmission start indication portion is 16. The first subblock is one of the following: 1001, 1010, 1100, 1011, 1101, 1110. The second subblock is one of the following: 0110, 1010, 1100, 0010, 0100, 1000. For example, the transmission start indication portion is one of the following: 1000 1110, 1001 0110, 1110 0100.

[0041] In one example, both the first and second subblocks are 1 / 4 (0.25) OFDM symbol lengths, and the M value of the transmission start indication portion is 12. The first subblock is one of the following: 101, 110. The second subblock is one of the following: 010, 100. For example, the transmission start indication portion is one of the following: 110 010, 110 100, 100 110.

[0042] In one example, both the first and second sub-blocks are 1 / 4 (0.25) OFDM symbol lengths, and the M value of the transmission start indication portion is 24. The first sub-block is one of the following: 100011, 100101, 100110, 101001, 101010, 101100, 110001, 110010, 110100, 111000, 100111, 101011, 101101, 101110, 110011, 110101, 110110, 111001, 111010, 111100, 101111, 110111, 111011, 111101, 111110. The second sub-block is one of the following: 001110, 010110, 011010, 011100, 100110, 101010, 110010, 110100, 111000, 000110, 001010, 001100, 010010, 010100, 011000, 100010, 100100, 101000, 110000, 000010, 000100, 001000, 010000, 100000. For example, the transmission start indication part is one of the following: 110001 001110, 110011 000110, 101111 000010, 101111 010000.

[0043] The candidate sequences of the first and second sub-blocks in the above embodiments can also be used when the transmission start indication portion has other M values. For example, the candidate sequences of the first and second sub-blocks listed above, where the length of both the first and second sub-blocks is 1 / 4 (0.25) OFDM symbol length and the M value of the transmission start indication portion is 24, can also be candidate sequences with an M value of 6 for the transmission start indication portion. Alternatively, in cases where the lengths of the first and second sub-blocks are different, such as the first sub-block being 1 / 4 (0.25) OFDM symbol length and the second sub-block being 3 / 4 (0.75) OFDM symbol length, and the M value of the transmission start indication portion being 8, 12, 16, or 24, the corresponding first sub-block can be selected from all or part of the first sub-blocks corresponding to the above M values, and the second sub-block can be constructed by selecting all of the second sub-blocks and a part of the first sub-blocks. In this application, the sequences of the first and second sub-blocks only limit the sequence length, not the M value used. The transmission start indication section can also be generated directly without distinguishing between the first sub-block and the second sub-block, but the result is the same as that generated by the first sub-block and the second sub-block mentioned above; that is, the result generated by the first sub-block and the second sub-block mentioned above can also be directly used for the definition of the transmission start indication section, without distinguishing between the first sub-block and the second sub-block, and the two have similar effects.

[0044] The sequences of patterns (1 OFDM symbol, 0.5 OFDM symbol, 0.25 OFDM symbol) in the first sub-block and / or second sub-block and / or transmission start indication section of this application also apply to the case where both the first and second sub-blocks consist of 1 OFDM symbol. For example, the SIP pattern M=12, 111000101100, where both the first and second sub-blocks consist of 0.5 OFDM symbols, is also used in the scenario where both the first and second sub-blocks consist of 1 OFDM symbol, i.e., M=6 for SIP, and the sequence is 111000101100. Other combinations are similar.

[0045] The patterns (0.5 OFDM symbols and 0.25 OFDM symbols) of the first and / or second sub-blocks in this application are also applicable when both the first and second sub-blocks consist of one OFDM symbol, for example: both the first and second sub-blocks consist of a pattern of 0.5 OFDM symbols. The SIP pattern M=24, 111000000000 000111100000, is also used in scenarios where both the first and second sub-blocks consist of one OFDM symbol, i.e., SIP M=12, with the sequence 111000000000 000111100000. Another example: both the first and second sub-blocks consist of a pattern of 0.5 OFDM symbols. The SIP pattern M=16, 10000111 00111100, is also used in scenarios where both the first and second sub-blocks are single OFDM symbols, i.e., SIP M=8, with the sequence 10000111 00111100.

[0046] The sequence of patterns (0.5 OFDM symbols, 0.25 OFDM symbols) of the first sub-block and / or the second sub-block in this application is also applicable to the case where the first sub-block and the second sub-block are of other lengths (e.g., 0.5 OFDM symbols, 1 OFDM symbol), such as: the first sub-block and the second sub-block are both SIP patterns of 0.25 OFDM symbols, the SIP is M=24, and the sequence is 110001 001110. It is also applicable to the scenario where the first sub-block and the second sub-block are both 0.5 OFDM symbols, that is: the SIP is M=12, and the sequence is 110001 001110. For example, a SIP pattern where both the first and second sub-blocks are 0.25 OFDM symbols, with SIP M=16 and a sequence of 1000 1110, can also be used in scenarios where both the first and second sub-blocks are 0.5 OFDM symbols, i.e., SIP M=8 and the sequence of 1000 1110. Another example: a SIP pattern where both the first and second sub-blocks are 0.25 OFDM symbols, with SIP M=16 and a sequence of 1110 1000, can also be used in scenarios where both the first and second sub-blocks are 1 OFDM symbol, i.e., SIP M=4 and the sequence of 1110 1000. Other combinations are similar.

[0047] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains a number of high-level chips greater than or equal to the number of low-level chips, and the second sub-block contains a number of high-level chips less than or equal to the number of low-level chips. The lengths of the first sub-block and the second sub-block may be different. The candidate sequence of the first sub-block and / or the second sub-block may be a sequence from the aforementioned candidate sequences of the first sub-block and / or the second sub-block.

[0048] In one embodiment, the first sub-block includes a high-low level transition, and the second sub-block includes one, two, or three high-low level transitions. The high-low level transitions include 01 and 10. For example, 11000 includes one 10 but not 01, therefore 11000 includes one high-low level transition. As another example, 00110001 includes two 01s and one 10, therefore 00110001 includes three high-low level transitions. In some embodiments, one high-low level transition of the first sub-block can be used for threshold determination, and multiple high-low level transitions in the second sub-block can be distinguished from the data or chip length indication portion, facilitating the detection of the transmission start indication portion.

[0049] For example, both the first and second sub-blocks contain 6 bits, and the transmission start indication portion is one of the following: 111000 001110, 111000 011100, 111000 100000, 111000 001110, 111000 011100.

[0050] For example, both the first and second sub-blocks contain 8 bits, and the transmission start indication portion is one of the following: 11111000 01110000, 11111000 00111000, 11111000 00011100, 11111000 00001110, 11111000 11111000, 11111100 01100000, 11111100 00110000, 11111100 00001100, 11111100 00000110, 11111110 11111110, 11100000 11100000.

[0051] For example, both the first and second sub-blocks contain 12 bits, and the transmission start indication portion is one of the following: 111111111000111111111000, 111111111000 001111111110, 111100000000 000011110000, 111110000000 000111110000, 111110000000 111110000000.

[0052] The candidate sequences for the first sub-block and / or the second sub-block may be sequences from the candidate sequences for the first sub-block and / or the second sub-block in other embodiments of this application.

[0053] In some embodiments, the number of high levels in the first sub-block is equal to the number of low levels in the second sub-block, and the number of low levels in the first sub-block is equal to the number of high levels in the second sub-block. The first sub-block includes one high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

[0054] In one embodiment, the chip length corresponding to the transmission start indication portion is different from the chip length corresponding to the data portion. Alternatively, it can be described that the M value corresponding to the transmission start indication portion is different from the M value corresponding to the data portion. Here, the M value refers to the number of chips included in an OFDM symbol. Different M values ​​correspond to different chip lengths, and the chip length can be determined based on the M value.

[0055] For example, SIP uses M=4, and the data portion uses M=2, 6, 12, 24, or M=1, 2, 6, 12, 24. For example, SIP uses M=6, and the data portion uses M=1, 2, 4, 8, 16, or M=1, 2, 4, 12, 24. For example, SIP uses M=8, and the data portion uses M=1, 2, 4, 6, 12, 24, or M=1, 2, 4, 24, or M=1, 2, 6, 12, 24. That is, the M value used in the Start of Transmission Indication (SIP) is not used in the data portion. Having a different chip length for the Start of Transmission Indication than for the data portion reduces the probability of the data portion being falsely detected as the Start of Transmission Indication, thereby improving detection performance.

[0056] In some embodiments, the chip length corresponding to the transmission start indication portion is different from the chip length corresponding to the data portion, and the first sub-block includes a high-low level transition, while the second sub-block includes one, two, or three high-low level transitions.

[0057] For example, SIP uses M=4, and the data portion uses M=2, 6, 12, 24 or M=1, 2, 6, 12, 24. The transmission start indication portion is one of the following: 1000, 1110.

[0058] For example, SIP uses M=6, and the data portion uses M=1, 2, 4, 8, 16, or M=1, 2, 4, 12, 24. The start-of-transmission indication portion is one of the following: 111100, 110000, 100000, 110010, 111010, 101000.

[0059] For example, SIP uses M=8, and the data portion uses M=1, 2, 4, 6, 12, 24, or M=1, 2, 4, 24, or M=1, 2, 6, 12, 24. The start-of-transmission indication portion is one of the following: 11000000, 10111000, 11100010, 11001110, 11101100, 10001100, 11001000.

[0060] For example, SIP uses M=12, and the data portion uses M=1, 2, 4, 6, 24, or M=1, 2, 6, 24, or M=2, 6, 24. The start-of-transmission indication portion is one of the following: 110001 001110, 110011 000110, 101111 000010, 101111 010000.

[0061] For example, SIP uses M=16, and the data portion uses M=1, 2, 4, 6, 12, 24, or M=1, 2, 6, 24, or M=2, 6, 24.

[0062] In some embodiments, the lengths of the first sub-block and the second sub-block are different. Or, the number of chips in the first sub-block and the second sub-block are different.

[0063] In some embodiments, the transmission start indication portion includes 6 chips, the first sub-block includes 2 chips, and the second sub-block includes 4 chips. For example, the first sub-block is 10, and the second sub-block is one of the following: 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110.

[0064] In some embodiments, the transmission start indication portion includes 6 chips, the first sub-block includes 4 chips, and the second sub-block includes 2 chips. For example, the second sub-block is 10, and the first sub-block is one of the following: 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110.

[0065] In some embodiments, the transmission start indication portion includes 12 chips, the first sub-block includes 2 chips, and the second sub-block includes 10 chips. For example, the first sub-block is 10 chips, and the second sub-block is one of the following: 0000000011, 0000000101, 0000000110, 0000001001, 0000001100, 0000010001, 0000011000, 0000100001, 000011000, 0000100001, 00001100000, 0010000001, 0011000000, 010 0000001, 0110000000, 1000000001, 1000000010, 1000000100, 1000001000, 100010000, 100100000, 1010000000, 1100000000, 10110000000, 1100000001, 1100000010, 1100000100, 110000 1000, 1100010000, 1100100000, 1101000000, 1110000000, 1100011000, 1101100000, 1110000001, 1110000010, 1110000100, 111001000, 1110100000, 1111000000, 00111100 00, 0100000111, 0110000011, 0111000001, 0111100000, 1110011000, 1110110000, 111100001, 1111000010, 1111000100, 1111001000, 1111010000, 1111100000, 0111100001, 0111110000, 1111100000.

[0066] In some embodiments, the transmission start indication portion includes 12 chips, with a first sub-block comprising 3 chips and a second sub-block comprising 9 chips. For example, the first sub-block includes one of the following: 101, 110. The second sub-block is one of the following: 110000010, 110000100, 110001000, 110100000, 111000000, 000110001, 000111000, 001000011, 001100001, 001110000, 010000011, 011000001, 011100000, 110011000. 110110000, 111000001, 111000010, 111000100, 111001000, 111010000, 111100000, 000111100, 001000111, 001100011, 001110001, 001111000, 010000111, 011000011, 011100001, 011110000.

[0067] In some embodiments, the transmission start indication portion includes 12 chips, with a first sub-block comprising 4 chips and a second sub-block comprising 8 chips. For example, the first sub-block includes one of the following: 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110. The second sub-block includes one of the following: 10011000, 10110000, 11000001, 11000010, 11001000, 11010000, 11100000, 00011100, 00100011, 00110001, 00111000, 01000011, 011 00001, 01110000, 00011000, 00100001, 00110000, 01000001, 01100000, 10000001, 10000010, 10000100, 1001000, 10100000, 11000000, 11110000.

[0068] In some embodiments, the transmission start indication portion includes 12 chips, with the first sub-block including 5 chips and the second sub-block including 7 chips. For example, the first sub-block includes one of the following: 10001, 10010, 10100, 11000, 10011, 10110, 11001, 11010, 11100, 01111, 10111, 11011, 11101, 11110. The second sub-block includes one of the following: 0000011, 0000101, 0000110, 0001001, 0001100, 0010001, 0011000, 0100001, 0110000, 1000001, 1000010, 1001000, 1010000, 1100000, 0000111, 00 01011, 0001101, 0001110, 0010011, 0011001, 0011100, 0100011, 0110001, 0111000, 1000011, 1000110, 1001100, 1011000, 1100001, 1100010, 1101000, 1110000.

[0069] In some embodiments, the transmission start indication portion includes 12 chips, with the first sub-block including 7 chips and the second sub-block including 5 chips. For example, the second sub-block includes one of the following: 10001, 10010, 10100, 11000, 10011, 10110, 11001, 11010, 11100, 01111, 10111, 11011, 11101, 11110. The first sub-block includes one of the following: 0000011, 0000101, 0000110, 0001001, 0001100, 0010001, 0011000, 0100001, 0110000, 1000001, 1000010, 1001000, 1010000, 1100000, 0000111, 00 01011, 0001101, 0001110, 0010011, 0011001, 0011100, 0100011, 0110001, 0111000, 1000011, 1000110, 1001100, 1011000, 1100001, 1100010, 1101000, 1110000.

[0070] In some embodiments, the transmission start indication portion includes 12 chips, with the first sub-block including 8 chips and the second sub-block including 4 chips. For example, the second sub-block includes one of the following: 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1001, 1010, 1011, 1100, 1101, 1110. The first sub-block includes one of the following: 10011000, 10110000, 11000001, 11000010, 11001000, 11010000, 11100000, 00011100, 00100011, 00110001, 00111000, 01000011, 011 00001, 01110000, 00011000, 00100001, 00110000, 01000001, 01100000, 10000001, 10000010, 10000100, 1001000, 10100000, 11000000, 11110000.

[0071] In some embodiments, the transmission start indication portion includes 12 chips, with a first sub-block comprising 9 chips and a second sub-block comprising 3 chips. For example, the second sub-block includes one of the following: 101, 110. The first sub-block is one of the following: 110000010, 110000100, 110001000, 110100000, 111000000, 000110001, 000111000, 001000011, 001100001, 001110000, 010000011, 011000001, 011100000, 110011000. 110110000, 111000001, 111000010, 111000100, 111001000, 111010000, 111100000, 000111100, 001000111, 001100011, 001110001, 001111000, 010000111, 011000011, 011100001, 011110000.

[0072] In some embodiments, the transmission start indication portion includes 12 chips, the first sub-block includes 10 chips, and the second sub-block includes 2 chips. For example, the second sub-block is 10 chips, and the first sub-block is one of the following: 0000000011, 0000000101, 0000000110, 0000001001, 0000001100, 0000010001, 0000011000, 0000010001, 000011000, 0000100001, 00001100000, 0010000001, 0011000000, 010 0000001, 0110000000, 1000000001, 1000000010, 1000000100, 1000001000, 100010000, 100100000, 1010000000, 1100000000, 10110000000, 1100000001, 1100000010, 1100000100, 110000 1000, 1100010000, 1100100000, 1101000000, 1110000000, 1100011000, 1101100000, 1110000001, 1110000010, 1110000100, 111001000, 1110100000, 1111000000, 00111100 00, 0100000111, 0110000011, 0111000001, 0111100000, 1110011000, 1110110000, 111100001, 1111000010, 1111000100, 1111001000, 1111010000, 1111100000, 0111100001, 0111110000, 1111100000.

[0073] In some embodiments, the different number of chips in the first and second sub-blocks allows for the design of more transmission start indication patterns, and different transmission start indications can be used under different requirements. In some embodiments, the first sub-block contains fewer chips than the second sub-block, and the chips in the first sub-block can be used for threshold adjustment, which can better detect the second sub-block and improve detection performance.

[0074] In this embodiment, the length of the Transmission Start Indication (SIP) portion can be the equivalent time length of the M value used. In the sequence, one 1 of M=P represents a high level with a length of 1 / P OFDM symbol length, and one 0 of M=P represents a low level with a length of 1 / P OFDM symbol length.

[0075] For example, if the M value used in SIP is 12 and the SIP sequence is 1111100000, then equivalently, SIP is a high level of 5 / 12 OFDM symbols followed by a low level of 7 / 12 OFDM symbols. For example, if an OFDM symbol is 66.67 microseconds (μs) long, then SIP is a high level of 5 / 12 * 66.67 microseconds followed by a low level of 7 / 12 * 66.67 microseconds. As another example, if the M value used in SIP is 6 and the SIP sequence is 101110, then equivalently, SIP is a high level of 1 / 6 OFDM symbols followed by a low level of 1 / 6 OFDM symbols followed by a high level of 1 / 2 OFDM symbols followed by a low level of 1 / 6 OFDM symbols. When an OFDM symbol is 66.67 microseconds (μs) long, the SIP is a high level of 1 / 6*66.67 microseconds followed by a low level of 1 / 6*66.67 microseconds, followed by a high level of 1 / 2*66.67 microseconds, followed by a low level of 1 / 6*66.67 microseconds.

[0076] In one embodiment, the high-low level sequence corresponding to the transmission start indication portion specifically includes one of the following: high level and low level; high level, low level and high level; low level, high level and low level; high level, low level, high level and low level.

[0077] In one embodiment, when the high-low level sequence corresponding to the transmission start indication portion is high level and low level, the ratio of the high level and low level specifically includes: 1:1, or 1:2, or 1:3, or 2:1, or 3:1, wherein the ratio of the high level and low level includes the duration ratio of the high level and low level, or the chip number ratio corresponding to the high level and low level.

[0078] In one embodiment, the high-low level sequence corresponding to the transmission start indication portion is high level and low level, and the duration ratio of the high level and low level is one of the following: 1:2, 1:3, 2:1, 3:1, 1:5, 5:1, 3:5, 5:3, 5:7, 7:5, 2:7, 7:2, 4:5, 5:4.

[0079] For example, the length of the transmission start indication part is 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 1:2. The transmission start indication part is one of the following: 100 (6), 111100000000 (24). 100 (6) represents that the M value of the transmission start indication part is 6, and the sequence is 100.

[0080] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 2:1. The transmission start indication part is one of the following: 110 (6), 111100 (12), 111111110000 (24).

[0081] The high and low level length patterns of the transmission start indication portions corresponding to 110(6), 111100(12), and 111111110000(24) are the same (a high level with a length of 1 / 3 OFDM symbol followed by a low level with a length of 1 / 6 OFDM symbol), and the total length is also the same, only the representation is different. In some embodiments of this application, only exemplary sequences and M values ​​are given, and other equivalent sequences and M values ​​of their corresponding transmission start indication portions will not be described in detail.

[0082] For example, the transmission start indication part is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 2:1. The transmission start indication part is one of the following: 111111110000(12), 111111111111111100000000(24).

[0083] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 2:1. The transmission start indication part is one of the following: 111111110000(6).

[0084] For example, the transmission start indication portion is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 2:1. The transmission start indication portion is one of the following: 111100(2).

[0085] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 1:3. The transmission start indication part is one of the following: 1000 (8), 11000000 (16).

[0086] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 3:1. The transmission start indication part is one of the following: 1110 (8), 11111100 (16).

[0087] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 1:3. The transmission start indication portion is one of the following: 1111000000000000(16).

[0088] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 3:1. The transmission start indication portion is one of the following: 1111111111110000(16).

[0089] For example, the transmission start indication portion is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 1:3. The transmission start indication portion is one of the following: 1000(2).

[0090] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 1:3. The transmission start indication part is one of the following: 111000000000(4).

[0091] For example, the transmission start indication portion is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 3:1. The transmission start indication portion is one of the following: 1110(2).

[0092] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 3:1. The transmission start indication part is one of the following: 111111111000(4).

[0093] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 1:5. The transmission start indication part is one of the following: 100000 (12), 1100000000000 (24).

[0094] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 5:1. The transmission start indication part is one of the following: 111110 (12), 111111111100 (24).

[0095] For example, the length of the transmission start indication portion is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 1:5. The transmission start indication portion is one of the following: 100000(6), 1100000000000(12), 1111000000000000000000000(24).

[0096] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 5:1. The transmission start indication portion is one of the following: 111110(6), 111111111100(12), 11111111111111111110000(24).

[0097] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 1:5. The transmission start indication part is one of the following: 110000000000(6).

[0098] For example, the transmission start indication portion is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with a duration ratio of 5:1 for the high and low levels. The transmission start indication portion is one of the following: 111111111100(6).

[0099] For example, the transmission start indication portion is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 1:5. The transmission start indication portion is one of the following: 100000(2).

[0100] For example, the transmission start indication portion is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with a duration ratio of 5:1 for the high and low levels. The transmission start indication portion is one of the following: 111110(2).

[0101] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 3:5. The transmission start indication portion is one of the following: 11100000(16).

[0102] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 5:3. The transmission start indication portion is one of the following: 11111000(16).

[0103] For example, the transmission start indication part is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 3:5. The transmission start indication part is one of the following: 1111110000000000 (16), 11111111100000000000000 (24).

[0104] For example, the transmission start indication part is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 5:3. The transmission start indication part is one of the following: 1111111111000000(16), 111111111111111000000000(24).

[0105] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 5:3. The transmission start indication part is one of the following: 11111000(4).

[0106] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 3:5. The transmission start indication part is one of the following: 11100000(4).

[0107] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 5:3. The transmission start indication part is one of the following: 111111111111111000000000(8).

[0108] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 3:5. The transmission start indication part is one of the following: 111111111000000000000000(8).

[0109] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 7:5. The transmission start indication portion is one of the following: 111111100000(24).

[0110] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level and low level, with the duration ratio of the high level and low level being 5:7. The transmission start indication portion is one of the following: 111110000000(24).

[0111] For example, the transmission start indication part is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 7:5. The transmission start indication part is one of the following: 111111100000(12), 111111111111110000000000(24).

[0112] For example, the transmission start indication part is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 5:7. The transmission start indication part is one of the following: 111110000000(12), 111111111100000000000000(24).

[0113] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 7:5. The transmission start indication part is one of the following: 111111100000(6).

[0114] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 5:7. The transmission start indication part is one of the following: 111110000000(6).

[0115] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 7:5. The transmission start indication part is one of the following: 111111100000(4).

[0116] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 5:7. The transmission start indication part is one of the following: 111110000000(4).

[0117] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 2:7. The transmission start indication part is one of the following: 111100 000000 000000(6), 11111111000000000000000000000000000000(12).

[0118] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with a duration ratio of 7:2 for the high level and low level. The transmission start indication part is one of the following: 11111111111110000(6), 111111111111111111111111111100000000(12).

[0119] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with a duration ratio of 4:5 for the high level and low level. The transmission start indication part is one of the following: 1111111100000000000(6), 1111111111111111100000000000000000000(12).

[0120] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with a duration ratio of 5:4 for the high level and low level. The transmission start indication part is one of the following: 1111111111000000000(6), 1111111111111111111110000000000000000(12).

[0121] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 1:2. The transmission start indication part is one of the following: 111100000000 (12), 111111110000000000000000 (24). 110000 (6) represents that the M value of the transmission start indication part is 6, and the sequence is 110000.

[0122] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 1:2. The transmission start indication part is one of the following: 111100000000(6), 1111111100000000000000000(12), 111111111111111100000000 000000000000000000000000(24).

[0123] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level and low level, with the duration ratio of the high level and low level being 1:2. The transmission start indication part is one of the following: 111111 000000 000000(6), 1111111111111 000000000000 000000000000(12), 11111111111111111111111111000000000000000000000000 0000000000000000000000000(24).

[0124] In one embodiment, when the high-low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, or when the high-low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, the ratio of the high level to the low level specifically includes: 1:1:1, or 1:2:1, or 1:1:2, or 2:1:1, or 1:4:1, or 1:1:4, or 4:1:1, or 3:2:1, or 1:2:3, or 1:3:2, or 3:1:2, or 2:3:1, or 2:1:3, or 2:1:2, or 2:2:1, or The ratios are 1:3:1, 1:1:3, 1:1:6, 3:2:3, 4:1:3, 4:3:1, 3:1:4, 3:4:1, 1:3:4, 1:4:3, 2:3:3, 3:3:2, 1:1:10, 5:2:5, 2:7:3, 3:7:2, 3:5:4, 4:5:3, 1:9:2, or 2:9:1; wherein the ratio of high level to low level includes the ratio of the duration of high level to low level, or the ratio of the number of chips corresponding to high level and low level.

[0125] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:1. The transmission start indication part is one of the following: 110011 (12), 111100001111 (24).

[0126] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:1. The transmission start indication part is one of the following: 111100001111(12), 111111110000000011111111(24).

[0127] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:1. The transmission start indication part is one of the following: 111100001111(6).

[0128] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, with the duration ratio of the high level and low level being 1:1:1. The transmission start indication part is one of the following: 110011(2).

[0129] For example, the transmission start indication part is 0.5 OFDM symbol length in length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, and the duration ratio of the high level and low level is 1:2:1. The transmission start indication part is one of the following: 1001 (8), 11000011 (16), 111000000111 (24).

[0130] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, and the duration ratio of the high level and low level is 1:2:1. The transmission start indication part is one of the following: 1001 (4), 111000000111 (12), 1111000000001111 (16), 111111000000000000111111 (24).

[0131] For example, the transmission start indication portion is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:2:1. The transmission start indication portion is one of the following: 1001(2).

[0132] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:2:1. The transmission start indication part is one of the following: 111000000111(4).

[0133] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:1:1. The transmission start indication part is one of the following: 1101 (8), 11110011 (16), 111111000111 (24).

[0134] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:1:1. The transmission start indication part is one of the following: 1101 (4), 111111000111 (12), 1111111100001111 (16), 111111111111000000111111 (24).

[0135] For example, the transmission start indication portion is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 2:1:1. The transmission start indication portion is one of the following: 1101(2).

[0136] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:1:1. The transmission start indication part is one of the following: 111111000111(4).

[0137] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:2. The transmission start indication part is one of the following: 1011 (8), 11001111 (16), 111000111111 (24).

[0138] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:2. The transmission start indication part is one of the following: 111000111111(12), 11110000111111111(16), 111111000000111111111111(24).

[0139] For example, the transmission start indication portion is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:2. The transmission start indication portion is one of the following: 1011(2).

[0140] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:2. The transmission start indication part is one of the following: 111000111111(4).

[0141] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, with the duration ratio of the high level and low level being 1:3:2. The transmission start indication part is one of the following: 100011 (12), 110000001111 (24).

[0142] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:3:2. The transmission start indication portion is one of the following: 100011(6).

[0143] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:3:2. The transmission start indication part is one of the following: 110000001111(6).

[0144] For example, the transmission start indication portion is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:3:2. The transmission start indication portion is one of the following: 100011(2).

[0145] For example, the length of the transmission start indication part is 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, and the duration ratio of the high level and low level is 1:2:3. The transmission start indication part is one of the following: 100111 (12), 110000111111 (24).

[0146] For example, the length of the transmission start indication portion is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:2:3. The transmission start indication portion is one of the following: 100111(6).

[0147] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:2:3. The transmission start indication part is one of the following: 110000111111(6).

[0148] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:2:3. The transmission start indication part is one of the following: 100111(2).

[0149] For example, the transmission start indication part is 0.5 OFDM symbol length in length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, and the duration ratio of the high level and low level is 3:1:2. The transmission start indication part is one of the following: 111011 (12), 111111001111 (24).

[0150] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 3:1:2. The transmission start indication portion is one of the following: 111011(6).

[0151] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:1:2. The transmission start indication part is one of the following: 111111001111(6).

[0152] For example, the transmission start indication portion is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 3:1:2. The transmission start indication portion is one of the following: 111011(2).

[0153] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:2:1. The transmission start indication part is one of the following: 111001 (12), 111111000011 (24).

[0154] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 3:2:1. The transmission start indication portion is one of the following: 111001(6).

[0155] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:2:1. The transmission start indication part is one of the following: 111111000011(6).

[0156] For example, the transmission start indication portion is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 3:2:1. The transmission start indication portion is one of the following: 111001(2).

[0157] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:4:1. The transmission start indication part is one of the following: 100001 (12), 110000000011 (24).

[0158] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:4:1. The transmission start indication portion is one of the following: 100001(6).

[0159] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:4:1. The transmission start indication part is one of the following: 110000000011(6).

[0160] For example, the transmission start indication portion is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:4:1. The transmission start indication portion is one of the following: 100001(2).

[0161] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 4:1:1. The transmission start indication part is one of the following: 111101 (12), 111111110011 (24).

[0162] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 4:1:1. The transmission start indication portion is one of the following: 111101(6).

[0163] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 4:1:1. The transmission start indication part is one of the following: 111111110011(6).

[0164] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 4:1:1. The transmission start indication part is one of the following: 111101(2).

[0165] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 1:1:4. The transmission start indication part is one of the following: 101111 (12), 110011111111 (24).

[0166] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:4. The transmission start indication portion is one of the following: 101111(6).

[0167] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:4. The transmission start indication part is one of the following: 110011111111(6).

[0168] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:4. The transmission start indication part is one of the following: 101111(2).

[0169] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:2:5. The transmission start indication part is one of the following: 10011111(16).

[0170] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, and the duration ratio of the high level and low level is 1:2:5. The transmission start indication part is one of the following: 1110000001111111111111111(8).

[0171] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:5:2. The transmission start indication portion is one of the following: 10000011(16).

[0172] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, and the duration ratio of the high level and low level is 1:5:2. The transmission start indication part is one of the following: 111000000000000000111111(8).

[0173] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high and low levels being 5:2:1. The transmission start indication portion is one of the following: 11111001(16).

[0174] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 5:2:1. The transmission start indication part is one of the following: 111111111111111000000111(8).

[0175] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 5:1:2. The transmission start indication portion is one of the following: 11111011(16).

[0176] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 5:1:2. The transmission start indication part is one of the following: 111111111111111000111111(8).

[0177] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:1:5. The transmission start indication part is one of the following: 11011111(16).

[0178] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, and the duration ratio of the high level and low level is 2:1:5. The transmission start indication part is one of the following: 1111110001111111111111111(8).

[0179] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 2:5:1. The transmission start indication portion is one of the following: 11000001(16).

[0180] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 2:5:1. The transmission start indication part is one of the following: 111111000000000000000111(8).

[0181] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:3:4. The transmission start indication portion is one of the following: 10001111(16).

[0182] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 1:3:4. The transmission start indication part is one of the following: 111000000000111111111111 (8).

[0183] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:4:3. The transmission start indication portion is one of the following: 10000111(16).

[0184] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 1:4:3. The transmission start indication part is one of the following: 111000000000000111111111(8).

[0185] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:1:4. The transmission start indication part is one of the following: 11101111(16).

[0186] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 3:1:4. The transmission start indication part is one of the following: 1111111110001111111111111(8).

[0187] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 3:4:1. The transmission start indication portion is one of the following: 11100001(16).

[0188] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 3:4:1. The transmission start indication part is one of the following: 111111111000000000000111(8).

[0189] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 4:3:1. The transmission start indication portion is one of the following: 11110001(16).

[0190] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 4:3:1. The transmission start indication part is one of the following: 111111111111000111(8).

[0191] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 4:1:3. The transmission start indication part is one of the following: 11110111(16).

[0192] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 4:1:3. The transmission start indication part is one of the following: 111111111111000111(8).

[0193] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:3:7. The transmission start indication part is one of the following: 110001111111(24).

[0194] For example, the transmission start indication part is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:3:7. The transmission start indication part is one of the following: 110001111111(12).

[0195] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:3:7. The transmission start indication part is one of the following: 110001111111(6).

[0196] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:3:7. The transmission start indication part is one of the following: 110001111111(4).

[0197] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:7:3. The transmission start indication part is one of the following: 110000000111(24).

[0198] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 2:7:3. The transmission start indication portion is one of the following: 110000000111(12).

[0199] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:7:3. The transmission start indication part is one of the following: 110000000111(6).

[0200] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:7:3. The transmission start indication part is one of the following: 110000000111(4).

[0201] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high and low levels being 3:7:2. The transmission start indication portion is one of the following: 111000000011(24).

[0202] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 3:7:2. The transmission start indication portion is one of the following: 111000000011(12).

[0203] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:7:2. The transmission start indication part is one of the following: 111000000011(6).

[0204] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:7:2. The transmission start indication part is one of the following: 111000000011(4).

[0205] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 2:1:2. The transmission start indication portion is one of the following: 11011(10).

[0206] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 2:1:2. The transmission start indication portion is one of the following: 1111001111(10).

[0207] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:1:2. The transmission start indication part is one of the following: 11111111000011111111(10).

[0208] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 2:1:2. The transmission start indication part is one of the following: 111111111111000000111111111111(10).

[0209] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 2:2:1. The transmission start indication portion is one of the following: 11001(10).

[0210] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 2:2:1. The transmission start indication portion is one of the following: 1111000011(10).

[0211] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:2:1. The transmission start indication part is one of the following: 11111111000000001111(10).

[0212] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 2:2:1. The transmission start indication part is one of the following: 111111111111000000000000111111(10).

[0213] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:3:1. The transmission start indication portion is one of the following: 10001(10).

[0214] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:3:1. The transmission start indication portion is one of the following: 1100000011(10).

[0215] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:3:1. The transmission start indication part is one of the following: 11110000000000001111(10).

[0216] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 1:3:1. The transmission start indication part is one of the following: 111111000000000000000000111111(10).

[0217] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:3. The transmission start indication portion is one of the following: 10111(10).

[0218] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:3. The transmission start indication portion is one of the following: 1100111111(10).

[0219] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:3. The transmission start indication part is one of the following: 11110000111111111111 (10).

[0220] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 1:1:3. The transmission start indication part is one of the following: 11111100000001111111111111111111 (10).

[0221] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:6. The transmission start indication part is one of the following: 10111111(16).

[0222] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, and the duration ratio of the high level and low level is 1:1:6. The transmission start indication part is one of the following: 1110001111111111111111111(8).

[0223] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 3:2:3. The transmission start indication portion is one of the following: 11100111(16).

[0224] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 3:2:3. The transmission start indication part is one of the following: 111111111000000111111111(8).

[0225] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high and low levels being 2:3:3. The transmission start indication portion is one of the following: 11000111(16).

[0226] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 2:3:3. The transmission start indication part is one of the following: 111111000000000111111111(8).

[0227] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:3:2. The transmission start indication part is one of the following: 11100011(16).

[0228] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level and high level, with the duration ratio of the high level and low level being 3:3:2. The transmission start indication part is one of the following: 111111111000000000111111(8).

[0229] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:10. The transmission start indication part is one of the following: 101111111111(24).

[0230] For example, the transmission start indication part is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:10. The transmission start indication part is one of the following: 101111111111(12).

[0231] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:10. The transmission start indication part is one of the following: 101111111111(6).

[0232] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:1:10. The transmission start indication part is one of the following: 101111111111(4).

[0233] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 5:2:5. The transmission start indication part is one of the following: 111110011111(24).

[0234] For example, the transmission start indication part is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 5:2:5. The transmission start indication part is one of the following: 111110011111(12).

[0235] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 5:2:5. The transmission start indication part is one of the following: 111110011111(6).

[0236] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 5:2:5. The transmission start indication part is one of the following: 111110011111(4).

[0237] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:5:4. The transmission start indication part is one of the following: 111000001111(24).

[0238] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level, with the duration ratio of the high level and low level being 3:5:4. The transmission start indication part is one of the following: 111000001111(12).

[0239] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:5:4. The transmission start indication part is one of the following: 111000001111(6).

[0240] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 3:5:4. The transmission start indication part is one of the following: 111000001111(4).

[0241] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 4:5:3. The transmission start indication part is one of the following: 111100000111(24).

[0242] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 4:5:3. The transmission start indication portion is one of the following: 111100000111(12).

[0243] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 4:5:3. The transmission start indication part is one of the following: 111100000111(6).

[0244] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 4:5:3. The transmission start indication part is one of the following: 111100000111(4).

[0245] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high and low levels being 1:9:2. The transmission start indication portion is one of the following: 100000000011(24).

[0246] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 1:9:2. The transmission start indication portion is one of the following: 100000000011(12).

[0247] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:9:2. The transmission start indication part is one of the following: 100000000011(6).

[0248] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 1:9:2. The transmission start indication part is one of the following: 100000000011(4).

[0249] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 2:9:1. The transmission start indication portion is one of the following: 110000000001(24).

[0250] For example, the length of the transmission start indication portion is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, with the duration ratio of the high level and low level being 2:9:1. The transmission start indication portion is one of the following: 110000000001(12).

[0251] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:9:1. The transmission start indication part is one of the following: 110000000001(6).

[0252] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, and high level, with the duration ratio of the high level and low level being 2:9:1. The transmission start indication part is one of the following: 110000000001(4).

[0253] For example, the length of the transmission start indication part is 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, and the duration ratio of the high level and low level is 1:1:1. The transmission start indication part is one of the following: 010 (6), 001100 (12), 000011110000 (24).

[0254] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, and the duration ratio of the high level and low level is 1:1:1. The transmission start indication part is one of the following: 001100 (6), 000011110000 (12).

[0255] For example, the length of the transmission start indication part is 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, and the duration ratio of the high level and low level is 1:2:1. The transmission start indication part is one of the following: 0110 (8), 00111100 (16).

[0256] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:1:1. The transmission start indication portion is one of the following: 0010(8).

[0257] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, and the duration ratio of the high level and low level is 2:1:1. The transmission start indication part is one of the following: 0010 (4), 00001100 (8).

[0258] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:2. The transmission start indication portion is one of the following: 0100 (8).

[0259] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:2. The transmission start indication portion is one of the following: 0100 (4).

[0260] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:3:2. The transmission start indication part is one of the following: 011100(12).

[0261] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:3:2. The transmission start indication portion is one of the following: 011100(6).

[0262] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:2:3. The transmission start indication part is one of the following: 011000(12).

[0263] For example, the length of the transmission start indication portion is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:2:3. The transmission start indication portion is one of the following: 011000(6).

[0264] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 3:1:2. The transmission start indication part is one of the following: 000100(12).

[0265] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 3:1:2. The transmission start indication portion is one of the following: 000100(6).

[0266] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 3:2:1. The transmission start indication part is one of the following: 000110(12).

[0267] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 3:2:1. The transmission start indication portion is one of the following: 000110(6).

[0268] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:4:1. The transmission start indication part is one of the following: 011110(12).

[0269] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:4:1. The transmission start indication portion is one of the following: 011110(6).

[0270] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 4:1:1. The transmission start indication part is one of the following: 000010(12).

[0271] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 4:1:1. The transmission start indication portion is one of the following: 000010(6).

[0272] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:4. The transmission start indication part is one of the following: 010000(12).

[0273] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:4. The transmission start indication portion is one of the following: 010000 (6).

[0274] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:2:5. The transmission start indication portion is one of the following: 01100000(16).

[0275] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:5:2. The transmission start indication part is one of the following: 01111100 (16).

[0276] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 5:2:1. The transmission start indication portion is one of the following: 00000110(16).

[0277] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 5:1:2. The transmission start indication portion is one of the following: 00000100 (16).

[0278] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:1:5. The transmission start indication portion is one of the following: 00100000 (16).

[0279] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:5:1. The transmission start indication portion is one of the following: 00111110(16).

[0280] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, low level, with the duration ratio of the high level and low level being 1:3:4. The transmission start indication part is one of the following: 01110000(16).

[0281] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:4:3. The transmission start indication portion is one of the following: 01111000 (16).

[0282] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 2:3:7. The transmission start indication part is one of the following: 001110000000(24).

[0283] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:3:7. The transmission start indication portion is one of the following: 001110000000(12).

[0284] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 2:3:7. The transmission start indication part is one of the following: 001110000000(6).

[0285] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 2:3:7. The transmission start indication part is one of the following: 001110000000(4).

[0286] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 2:7:3. The transmission start indication part is one of the following: 001111111000(24).

[0287] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:7:3. The transmission start indication portion is one of the following: 001111111000(12).

[0288] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 2:7:3. The transmission start indication part is one of the following: 001111111000(6).

[0289] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 2:7:3. The transmission start indication part is one of the following: 001111111000(4).

[0290] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 3:7:2. The transmission start indication part is one of the following: 000111111100(24).

[0291] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 3:7:2. The transmission start indication portion is one of the following: 000111111100(12).

[0292] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 3:7:2. The transmission start indication part is one of the following: 000111111100(6).

[0293] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 3:7:2. The transmission start indication part is one of the following: 000111111100(4).

[0294] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:1:2. The transmission start indication portion is one of the following: 00100(10).

[0295] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:1:2. The transmission start indication portion is one of the following: 0000110000 (10).

[0296] For example, the length of the transmission start indication portion is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:1:2. The transmission start indication portion is one of the following: 00000000111100000000(10).

[0297] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, with the duration ratio of the high level and low level being 2:1:2. The transmission start indication part is one of the following: 000000000000111111000000000000(10).

[0298] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:2:1. The transmission start indication portion is one of the following: 00110(10).

[0299] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:2:1. The transmission start indication portion is one of the following: 0000111100 (10).

[0300] For example, the transmission start indication portion is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:2:1. The transmission start indication portion is one of the following: 00000000111111110000(10).

[0301] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, with the duration ratio of the high level and low level being 2:2:1. The transmission start indication part is one of the following: 000000000000111111111111000000(10).

[0302] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:3:1. The transmission start indication portion is one of the following: 01110(10).

[0303] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:3:1. The transmission start indication portion is one of the following: 0011111100 (10).

[0304] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:3:1. The transmission start indication part is one of the following: 00001111111111110000(10).

[0305] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:3:1. The transmission start indication part is one of the following: 000000111111111111111111000000(10).

[0306] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:3. The transmission start indication portion is one of the following: 01000 (10).

[0307] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:3. The transmission start indication portion is one of the following: 0011000000(10).

[0308] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:3. The transmission start indication part is one of the following: 00001111000000000000 (10).

[0309] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, with the duration ratio of the high level and low level being 1:1:3. The transmission start indication part is one of the following: 000000111111000000000000000000 (10).

[0310] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:6. The transmission start indication part is one of the following: 01000000(16).

[0311] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, with the duration ratio of the high level and low level being 1:1:6. The transmission start indication part is one of the following: 000111000000000000000000 (8).

[0312] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 3:2:3. The transmission start indication part is one of the following: 00011000 (16).

[0313] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, with the duration ratio of the high level and low level being 3:2:3. The transmission start indication part is one of the following: 000000000111111000000000(8).

[0314] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:3:3. The transmission start indication portion is one of the following: 00111000 (16).

[0315] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, with the duration ratio of the high level and low level being 2:3:3. The transmission start indication part is one of the following: 000000111111111000000000(8).

[0316] For example, the transmission start indication portion is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 3:3:2. The transmission start indication portion is one of the following: 00011100 (16).

[0317] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is low level, high level and low level, with the duration ratio of the high level and low level being 3:3:2. The transmission start indication part is one of the following: 000000000111111111000000(8).

[0318] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:10. The transmission start indication part is one of the following: 010000000000 (24).

[0319] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:10. The transmission start indication portion is one of the following: 010000000000(12).

[0320] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:10. The transmission start indication part is one of the following: 010000000000(6).

[0321] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:10. The transmission start indication part is one of the following: 010000000000(4).

[0322] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 5:2:5. The transmission start indication part is one of the following: 000001100000(24).

[0323] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 5:2:5. The transmission start indication portion is one of the following: 000001100000(12).

[0324] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 5:2:5. The transmission start indication part is one of the following: 000001100000(6).

[0325] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 5:2:5. The transmission start indication part is one of the following: 000001100000(4).

[0326] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 3:5:4. The transmission start indication part is one of the following: 000111110000(24).

[0327] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 3:5:4. The transmission start indication portion is one of the following: 000111110000(12).

[0328] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 3:5:4. The transmission start indication part is one of the following: 000111110000(6).

[0329] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 3:5:4. The transmission start indication part is one of the following: 000111110000(4).

[0330] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 4:5:3. The transmission start indication part is one of the following: 000011111000(24).

[0331] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 4:5:3. The transmission start indication part is one of the following: 000011111000(12).

[0332] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 4:5:3. The transmission start indication part is one of the following: 000011111000(6).

[0333] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 4:5:3. The transmission start indication part is one of the following: 000011111000(4).

[0334] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:9:2. The transmission start indication part is one of the following: 011111111100(24).

[0335] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 1:9:2. The transmission start indication portion is one of the following: 011111111100(12).

[0336] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:9:2. The transmission start indication part is one of the following: 011111111100(6).

[0337] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 1:9:2. The transmission start indication part is one of the following: 011111111100(4).

[0338] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 2:9:1. The transmission start indication part is one of the following: 001111111110(24).

[0339] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, with the duration ratio of the high level and low level being 2:9:1. The transmission start indication portion is one of the following: 001111111110(12).

[0340] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 2:9:1. The transmission start indication part is one of the following: 001111111110(6).

[0341] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is low level, high level, and low level, with the duration ratio of the high level and low level being 2:9:1. The transmission start indication part is one of the following: 001111111110(4).

[0342] In one embodiment, when the high-low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, the ratio of the high level to the low level specifically includes: a repetition of a preset high-level to low-level ratio, or a combination of any two preset high-level to low-level ratios. Specifically, the preset high-level to low-level ratio includes: 1:1, 1:2, 1:3, 2:1, and 3:1. The ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the ratio of the number of chips corresponding to the high level and the low level.

[0343] In one embodiment, the high-low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, and the duration ratio of the high level and low level is one of the following: 1:1:1:3, or 1:1:3:1, or 1:1:1:2, or 1:1:2:1, or 2:1:2:1, or 1:2:1:2, or 1:1:1:1, or 3:1:3:1, or 1:3:1:3, or 1:2:1:3, or 2:1:1:3, or 1:2:3:1, or 3:1:1:3, or 2:1:1:2, or 1:3:3:1, or 1:2:2:1.

[0344] For example, the transmission start indication part is 0.5 OFDM symbol length long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:1:1:3. The transmission start indication part is one of the following: 101000(12).

[0345] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:1:3. The transmission start indication portion is one of the following: 101000(6).

[0346] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:1:1:3. The transmission start indication part is one of the following: 110011000000(6).

[0347] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:1:1:3. The transmission start indication part is one of the following: 110011000000(4).

[0348] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 1:1:3:1. The transmission start indication part is one of the following: 101110(12).

[0349] For example, the length of the transmission start indication portion is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:1:3:1. The transmission start indication portion is one of the following: 101110(6).

[0350] For example, the transmission start indication part is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 1:1:3:1. The transmission start indication part is one of the following: 110011111100(6).

[0351] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:1:3:1. The transmission start indication part is one of the following: 110011111100(4).

[0352] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 2:1:2:1. The transmission start indication part is one of the following: 110110(12).

[0353] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 2:1:2:1. The transmission start indication portion is one of the following: 110110(6).

[0354] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 2:1:2:1. The transmission start indication part is one of the following: 111100111100(6).

[0355] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 2:1:2:1. The transmission start indication part is one of the following: 110110(2).

[0356] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 1:2:1:2. The transmission start indication part is one of the following: 100100(12).

[0357] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:2:1:2. The transmission start indication part is one of the following: 100100(6).

[0358] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:2:1:2. The transmission start indication part is one of the following: 110000110000(6).

[0359] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 1:2:1:2. The transmission start indication part is one of the following: 100100(2).

[0360] For example, the length of the transmission start indication part is 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:1:1:1. The transmission start indication part is one of the following: 1010 (8), 111000111000 (24).

[0361] For example, the transmission start indication portion is 2 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:1:1. The transmission start indication portion is one of the following: 1010(2).

[0362] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:1:1:1. The transmission start indication part is one of the following: 111000111000(4).

[0363] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 3:1:3:1. The transmission start indication part is one of the following: 11101110(16).

[0364] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 3:1:3:1. The transmission start indication part is one of the following: 111111111000111111111000(8).

[0365] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 1:3:1:3. The transmission start indication part is one of the following: 10001000 (16).

[0366] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:3:1:3. The transmission start indication part is one of the following: 111000000000111000000000(8).

[0367] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 3:1:1:3. The transmission start indication part is one of the following: 11101000(16).

[0368] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 3:1:1:3. The transmission start indication part is one of the following: 111111111000111000000000(8).

[0369] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 2:1:1:2. The transmission start indication part is one of the following: 110100(12).

[0370] For example, the transmission start indication portion is one OFDM symbol long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 2:1:1:2. The transmission start indication portion is one of the following: 110100(6).

[0371] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 2:1:1:2. The transmission start indication part is one of the following: 111100110000(6).

[0372] For example, the transmission start indication portion is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 2:1:1:2. The transmission start indication portion is one of the following: 110100(2).

[0373] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 1:3:3:1. The transmission start indication portion is one of the following: 10001110(16).

[0374] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:3:3:1. The transmission start indication part is one of the following: 111000000000111111111000(8).

[0375] For example, the transmission start indication part is 0.5 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 1:2:2:1. The transmission start indication part is one of the following: 100110(12).

[0376] For example, the length of the transmission start indication portion is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 1:2:2:1. The transmission start indication portion is one of the following: 100110(6).

[0377] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:2:2:1. The transmission start indication part is one of the following: 110000111100(6).

[0378] For example, the transmission start indication part is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, with the duration ratio of the high level and low level being 1:2:2:1. The transmission start indication part is one of the following: 100110(2).

[0379] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 4:8:3:9. The transmission start indication part is one of the following: 111100000000111000000000(24).

[0380] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 4:8:3:9. The transmission start indication part is one of the following: 111100000000111000000000(12).

[0381] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 4:8:3:9. The transmission start indication part is one of the following: 111100000000111000000000(8).

[0382] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 8:4:3:9. The transmission start indication part is one of the following: 111111110000111000000000(24).

[0383] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 8:4:3:9. The transmission start indication part is one of the following: 111111110000111000000000(12).

[0384] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 8:4:3:9. The transmission start indication part is one of the following: 111111110000111000000000(8).

[0385] For example, the length of the transmission start indication part is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 4:8:9:3. The transmission start indication part is one of the following: 111100000000111111111000(24).

[0386] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 4:8:9:3. The transmission start indication part is one of the following: 111100000000111111111000(12).

[0387] For example, the length of the transmission start indication part is 3 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 4:8:9:3. The transmission start indication part is one of the following: 111100000000111111111000(8).

[0388] For example, the transmission start indication portion has a length of 0.5 OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:2:1. The transmission start indication portion is one of the following: 10110(10).

[0389] For example, the length of the transmission start indication portion is one OFDM symbol length, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:2:1. The transmission start indication portion is one of the following: 1100111100 (10).

[0390] For example, the length of the transmission start indication part is 2 OFDM symbol lengths, and the high and low level sequence corresponding to the transmission start indication part is high level, low level, high level and low level, and the duration ratio of the high level and low level is 1:1:2:1. The transmission start indication part is one of the following: 11110000111111110000(10).

[0391] For example, the transmission start indication portion is 3 OFDM symbol lengths long, and the high and low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, with the duration ratio of the high level and low level being 1:1:2:1. The transmission start indication portion is one of the following: 111111000000111111111111000000(10).

[0392] In one embodiment, the data transmission method applied to a first communication node further includes: receiving a chip length indication portion. The preamble also includes a chip length indication portion. That is, the preamble includes a transmission start indication portion and a chip length indication portion. The first communication node receives data based on the transmission start indication portion and the chip length indication portion. The transmission start indication portion precedes the chip length indication portion. The M value of the transmission start indication portion is fixed. The M value of the chip length indication portion is the same as the M value of the data portion. In one downlink transmission, the M value of the chip length indication portion is only one. However, in multiple downlink transmissions, the M value of the chip length indication portion can be different. In multiple downlink transmissions, the M value of the transmission start indication portion is the same.

[0393] In some embodiments, the M value of the chip length indication portion is different from the M value of the transmission start indication portion.

[0394] In one embodiment, the data transmission method applied to the first communication node further includes: determining the pattern of the chip length indication portion based on a first chip quantity; wherein the first chip quantity is the number of chips contained in one OFDM symbol of the data portion. In a single downlink transmission, the number of chips contained in one OFDM symbol of the data portion remains constant, i.e., the M value remains constant. The second communication node determines the pattern of the chip length indication portion based on the M value of the data portion to be transmitted. The first communication node determines the M value of the data portion based on the received pattern of the chip length indication portion. The pattern of the chip length indication portion represents the number of chips and / or the sequence of chips in the chip length indication portion. Different patterns represent different numbers of chips and / or different sequences.

[0395] In one embodiment, the data transmission method applied to the first communication node further includes: when the first chip quantity is a value in a first set, the chip length indication portion includes a first number of chips; when the first chip quantity is a value in a second set, the chip length indication portion includes a second number of chips. Wherein, the first quantity is even and the second quantity is odd, or the first quantity is a first even number and the second quantity is a second even number.

[0396] In some embodiments, the first quantity is 4, and the second quantity is 3, 5, 7, 9, 11, or 13; or, the first quantity is 4, and the second quantity is 6, 8, 12, 16, or 24; or, the first quantity is 6, and the second quantity is 8, 12, 16, or 24; or, the first quantity is 6, and the second quantity is 7, 9, 11, 13, 15, or 23.

[0397] In some embodiments, the first set includes M values ​​less than a first threshold, and the second set includes M values ​​greater than or equal to the first threshold. The first threshold is a positive integer greater than or equal to 8 and less than 32, or a positive integer greater than or equal to 6 and less than or equal to 24. The candidate set of M values ​​is at least one of {1, 2, 4, 6, 8, 12, 16, 24, 32}.

[0398] For example, the first set of values ​​includes at least one of the following: {1, 2, 4, 6, 8, 12}. For example, the second set of values ​​includes at least one of the following: {8, 12, 16, 24, 32}. For example, the first set includes at least {1, 2, 6}, and the second set includes at least {12, 24}. For example, the first set includes at least {2, 6}, and the second set includes at least {12, 24}. For example, the first set includes at least {1, 2, 6, 12}, and the second set includes at least {24}. For example, the first set includes at least {2, 6, 12}, and the second set includes at least {24}.

[0399] In one embodiment, the data transmission method applied to a first communication node further includes: when the number of first chips is less than a first threshold, the chip length indication portion includes a first number of chips; when the number of first chips is greater than or equal to the first threshold, the chip length indication portion includes a second number of chips. Wherein, the first threshold is a positive integer greater than or equal to 8 and less than 32. Wherein, the first number is an even number, and the second number is an odd number. For example, the first threshold is 8, and the first number is 4. For example, the second number is 5, 7, 3, or 9.

[0400] In some embodiments, the chip length indicator portion is an alternating sequence of '1' and '0'. For example, when the number of chips in the chip length indicator portion is 4, the chip length indicator portion is '1010', and when the number of chips in the chip length indicator portion is 5, the chip length indicator portion is '10101'.

[0401] In some embodiments, when the number of the first chips is less than 12, the chip length indication portion contains 4 chips and the chip length indication portion is '1010'; when the number of the first chips is greater than or equal to 12, the chip length indication portion contains 7 chips and the chip length indication portion is '1010101'.

[0402] In some embodiments, when the number of the first chips is less than 16, the chip length indication portion contains 4 chips and the chip length indication portion is '1010'; when the number of the first chips is greater than or equal to 16, the chip length indication portion contains 5 chips and the chip length indication portion is '10101'.

[0403] In some embodiments, when the number of the first chips is less than 16, the chip length indication portion contains 4 chips and the chip length indication portion is '1010'; when the number of the first chips is greater than or equal to 16, the chip length indication portion contains 3 chips and the chip length indication portion is '101'.

[0404] When the number of chips in the first part is less than the first threshold, a chip length is relatively long. If the number of high-level and low-level signals in an OFDM symbol is not the same, it will lead to a significant difference in the transmission power of high-level signals in different OFDM symbols, which is detrimental to the detection of the first communication node. When the chip length indicator includes an even number of chips, since the chip length indicator is an alternating sequence of '1' and '0', the number of high-level and low-level signals in the chip length indicator is the same, preventing differences in the number of high-level signals in different OFDM symbols, thus facilitating the first communication node's reception of the chip length indicator and data. When the number of chips in the first part is greater than or equal to the first threshold, a chip length is relatively short, and the difference in the number of high-level and low-level signals in an OFDM symbol is small, which will not affect the detection of the first communication node. Furthermore, including an odd number of chips in the chip length indicator can effectively reduce the impact of the cyclic prefix (CP) during data transmission, which is beneficial for the first communication node's data reception. This can solve the CP impact of short chips and achieve a balance between the resource overhead of long chips and the detection performance of short chips.

[0405] In one example, the number of chips contained in one OFDM symbol of the data portion is one of the following: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}. {16, 24}, {2, 4, 16, 24}, {2, 4, 8, 24}, {2, 6, 12, 24}, {2, 6, 16, 24}, {2, 8, 24}, {2, 8, 16}, {2, 6, 16}, {1, 6, 16}, {1, 4, 16}, {2, 4, 8, 16}, {2, 6, 12, 16}, {2, 6, 8, 16}, {1, 4, 8, 16}, {1, 2, 4, 6, 8, 16}, {2, 4, 6, 16}.

[0406] In some embodiments, the M value of the data portion has three possible values. The M value of the data portion can be one of the following: {1, 2, 16}, {1, 4, 16}, {1, 6, 16}, {1, 8, 16}, {1, 12, 16}, {2, 4, 16}, {2, 6, 16}, {2, 8, 16}, {2, 12, 16}, {4, 6, 16}, {4, 8, 16}, {4, 12, 16}, {6, 8, 16}, {6, 12, 16}, {8, 12, 16}.

[0407] In some embodiments, the M value of the data portion has three possible values. The M value of the data portion can be one of the following: {1, 2, 32}, {1, 4, 32}, {1, 6, 32}, {1, 8, 32}, {1, 12, 32}, {2, 4, 32}, {2, 6, 32}, {2, 8, 32}, {2, 12, 32}, {4, 6, 32}, {4, 8, 32}, {4, 12, 32}, {6, 8, 32}, {6, 12, 32}, {8, 12, 32}.

[0408] In some embodiments, the M value of the data portion has three possible values. The M value of the data portion can be one of the following: {1, 2, 24}, {1, 4, 24}, {1, 6, 24}, {1, 8, 24}, {1, 12, 24}, {2, 4, 24}, {2, 8, 24}, {2, 12, 24}, {4, 6, 24}, {4, 8, 24}, {4, 12, 24}, {6, 8, 24}, {6, 12, 24}, {8, 12, 24}.

[0409] The data portion of the above embodiment has only 3 M values. The interval between different M values ​​can be increased to reduce false detections of M values ​​or chip length.

[0410] In some embodiments, the M value of the data portion has four possible values. The M value of the data portion can be one of the following: {1, 2, 4, 6}, {1, 2, 4, 12}, {1, 2, 4, 16}, {1, 2, 4, 24}, {1, 2, 4, 32}, {1, 2, 6, 8}, {1, 2, 6, 12}, {1, 2, 6, 16}, {1, 2, 6, 24}, {1, 2, 6, 32}, {1, 2, 8, 12}, {1, 2, 8, 16}, {1, 2, 8, 24}, {1, 2, 8, 32}, {1, 2, 12, 16}, {1, 2, 12, 24}, {1, 2, 12, 32} {1, 4, 6, 8}, {1, 4, 6, 12}, {1, 4, 6, 16}, {1, 4, 6, 24}, {1, 4, 6, 32}, {1, 4, 8, 12}, {1, 4, 8, 16}, {1, 4, 8, 24}, {1, 4, 8, 32}, {1, 4, 12, 16}, {1, 4, 12, 24}, {1, 4, 12, 32}, {1, 6, 8, 12}, {1, 6, 8, 16}, {1, 6, 8, 24}, {1, 6, 8, 32}, {1, 6, 12, 16}, {1, 6, 12, 24}, {1, 6, 12, 32}, {1, 8, 12, 16}, {1, 8, 12, 24}, {1, 8, 12, 32}, {2, 4, 6, 8}, {2, 4, 6, 12}, {2, 4, 6, 16}, {2, 4, 6, 24}, {2, 4, 6, 32}, {2, 4, 8, 12}, {2, 4, 8, 16}, {2, 4, 8, 24}, {2, 4, 8, 32}, {2, 4, 12, 16}, {2, 4, 12, 24}, {2, 4, 12, 32}, {2, 6, 8, 12}, {2, 6, 8, 16}, {2, 6 {2, 6, 8, 32}, {2, 6, 12, 16}, {2, 6, 12, 24}, {2, 6, 12, 32}, {2, 8, 12, 16}, {2, 8, 12, 24}, {2, 8, 12, 32}, {4, 6, 8, 12}, {4, 6, 8, 16}, {4, 6, 8, 24}, {4, 6, 8, 32}, {4, 6, 12, 16}, {4, 6, 12, 24}, {4, 6, 12, 32}, {4, 8, 12, 16}, {4, 8, 12, 24}, {4, 8, 12, 32}.

[0411] The data section has only four possible M values, which helps the device determine the M value of the data section through the chip length indicator, reducing false detections, reducing the complexity of device implementation, and meeting the rate requirements of various services.

[0412] In some embodiments, the M value of the data portion has five possible values. The M value of the data portion can be one of the following: {1, 2, 4, 6, 32}, {1, 2, 4, 8, 32}, {1, 2, 4, 12, 32}, {1, 2, 6, 8, 32}, {1, 2, 6, 12, 32}, {1, 2, 8, 12, 32}, {1, 4, 6, 8, 32}, {1, 4, 6, 12, 32}, {1, 4, 8, 12, 32}, {1, 6, 8, 12, 32}, {2, 4, 6, 8, 32}, {2, 4, 8, 12, 32}, {2, 6, 8, 12, 32}, {4, 6, 8, 12, 32}.

[0413] The M value of the aforementioned data portion includes 32, which allows more data to be transmitted within an OFDM symbol, thereby improving transmission efficiency.

[0414] In some embodiments, the M value of the data portion has five possible values. The M value of the data portion can be one of the following: {1, 2, 4, 6, 12}, {1, 2, 4, 6, 16}, {1, 2, 4, 6, 24}, {1, 2, 4, 8, 12}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 16}, {1, 2, 4, 12, 24}, {1, 2, 6, 8, 12}, {1, 2, 6, 8, 16}, {1, 2, 6, 8, 24}, {1, 2, 6, 12, 16}, {1, 2, 6, 12, 24}, {1, 2, 8, 12, 16}, {1, 2, 8, 12, 24}, {1, 4, 6, 8, 12}, {1, 4, 6, 8, 16 ... ,24},{1,4,6,12,16},{1,4,6,12,24},{1,4,8,12,16},{1,4,8,12,24},{1,6,8,12,16},{1,6,8,12,24},{2,4,6,8,12},{2,4,6,8,16},{2,4,8,12,24},{2,4,8,12,24},{2,6,8,12,16},{2,6,8,12,24},{4,6,8,12,16},{4,6,8,12,24}。

[0415] In some embodiments, the M value of the data portion has six possible values. The M value of the data portion can be one of the following: {1, 2, 4, 6, 8, 12}, {1, 2, 4, 6, 8, 16}, {1, 2, 4, 6, 8, 24}, {1, 2, 4, 12, 16, 24}, {1, 2, 6, 8, 12, 16}, {1, 2, 6, 8, 12, 24}, {1, 2, 6, 8, 16, 24}, {1, 2, 6, 12, 16, 24}, {1, 2, 8, 12, 16, 24}, {1, 4, 6, 8, 12, 16}, {1, 4, 6, 8, 1 2, 24}, {1, 4, 6, 8, 16, 24}, {1, 4, 6, 12, 16, 24}, {1, 4, 8, 12, 16, 24}, {1, 6, 8, 12, 16, 24}, {2, 4, 6, 8, 12, 16}, {2, 4, 6, 8, 16, 24}, {2, 4, 6, 12, 16, 24}, {2, 6, 8, 12, 16, 24}, {4, 6, 8, 12, 16, 24}.

[0416] The M value in the above data section has 5 or 6 possible values, which can support the transmission of more data rates and is beneficial for supporting various scenario requirements.

[0417] In some embodiments, the M value of the data portion has six possible values. The M value of the data portion can be one of the following: {1, 2, 4, 6, 8, 32}, {1, 2, 6, 8, 12, 32}, {1, 4, 6, 8, 12, 32}, {2, 4, 6, 8, 12, 32}, {2, 4, 6, 8, 16, 32}.

[0418] The data portion above has six possible M values, including 32. This supports transmission at various data rates and accommodates higher data rate requirements.

[0419] In one embodiment, the method applied to the first communication node further includes receiving control information sent by the second communication node. The control information includes an information type, and the first communication node determines at least one of the following based on the information type: transport block size, presence of a CRC, CRC length, presence of an end-of-transmission code after the data portion, or presence of an end-of-transmission code after the data portion. The transport block size is the transport block size for downlink data transmission. The presence of an end-of-transmission code indicates that the downlink transmission includes an end-of-transmission code. The control information can also be described as a control portion. The information type indicates the type of downlink transmission. For example, the type of downlink transmission could be Msg 2, paging, etc. Alternatively, the information type indicates the command type of the downlink transmission. For example, the command type could be a paging command, a read command, a write command, etc. The first communication node determining at least one of the following based on the information type—transport block size, presence of a CRC, CRC length, presence of an end-of-transmission code after the data portion, or presence of an end-of-transmission code after the data portion—can be understood as an implicit indication method. Compared to explicitly indicating the above content via signaling, the implicit indication method can save signaling overhead.

[0420] In one embodiment, when the information type is a first type, the first communication node determines the transport block size according to the information type; when the information type is a second type, the first communication node determines that there is an end code after the data portion according to the information type.

[0421] In one embodiment, when the information type is a first type, the first communication node determines the transport block size according to the information type and there is no end code after the data portion; when the information type is a second type, the first communication node determines that there is an end code after the data portion according to the information type.

[0422] In some embodiments, the first type of information type includes information types with a fixed downlink transmission data block / transfer block size associated with the information type. The second type of information type includes information types with a variable downlink transmission data block / transfer block size associated with the information type. For example, the information type is msg 1 for 3-step access, where the data block / transfer block size is fixed in each downlink transmission of the information type, and therefore belongs to the first type. As another example, the information type is a read command, where the data block / transfer block size changes according to different needs in each downlink transmission of the information type, and therefore belongs to the second type.

[0423] When the information type is type one, the transport block size for downlink data transmission is fixed, and there is a one-to-one correspondence between the information type and the transport block size. Therefore, the first communication node can determine the transport block size based on the information type. When the information type is type two, the transport block size for downlink data transmission is variable, so the first communication node cannot determine the transport block size based on the information type. However, the second communication node can send an end code after the downlink data transmission, allowing the first communication node to determine the end of the downlink data transmission by detecting the end code. Therefore, when the information type is type two, the first communication node can determine that the transport block size of the data portion is variable based on the information type, and the presence of an end code after the data portion helps the first communication node receive the data.

[0424] In some embodiments, when the information type is a first type, the first communication node determines the transport block size and whether a CRC exists in the downlink transmission based on the information type; when the information type is a second type, the first communication node determines whether an end code exists after the data portion and whether a CRC exists in the downlink transmission based on the information type.

[0425] In some embodiments, when the information type is a first type, the first communication node determines the transport block size and the absence of CRC in the downlink transmission based on the information type; when the information type is a second type, the first communication node determines that an end code exists after the data portion and that CRC exists in the downlink transmission based on the information type.

[0426] In some embodiments, when the information type is a first type, the first communication node determines that the downlink transmission does not have a CRC based on the information type; when the information type is a second type, the first communication node determines that the downlink transmission has a CRC based on the information type.

[0427] In some embodiments, the first communication node can determine the transport block size or the range of transport block sizes by the information type. The transport block size is related to the presence and / or length of the CRC. Therefore, the length of the CRC and / or the presence of the CRC can be determined based on the information type.

[0428] In some embodiments, the information type is associated with the presence and / or length of a CRC in the downlink transmission; therefore, the first communication node can determine the presence and / or length of a CRC based on the information type. For example, the presence and / or length of a CRC in the downlink transmission corresponding to each information type are predefined. The first communication node can determine the presence and / or length of a CRC based on the information type.

[0429] In some embodiments, when the information type is a first type, the first communication node determines that the downlink transmission does not have a CRC based on the information type; when the information type is a second type, the first communication node determines that the downlink transmission has a CRC based on the information type, and the CRC length is 6; when the information type is a third type, the first communication node determines that the downlink transmission has a CRC based on the information type, and the CRC length is 16.

[0430] In some embodiments, when the information type is a first type, the first communication node determines that the downlink transmission does not have a CRC based on the information type; when the information type is a second type, the first communication node determines that the downlink transmission has a CRC based on the information type, and the CRC length is A; when the information type is a third type, the first communication node determines that the downlink transmission has a CRC based on the information type, and the CRC length is B. A and B are positive integers less than 30.

[0431] In some embodiments, the method applied to the first communication node further includes receiving control information sent by the second communication node; the control information includes first joint coding information. The first joint coding information indicates at least one of the following: whether forward error correction (FEC) is enabled, the code rate, and the number of repetitions.

[0432] For example, the first joint encoding information contains 2 bits, with a total of 4 values, including '00', '01', '10', and '11'. These 4 values ​​respectively indicate "FEC disabled", "FEC enabled with a bit rate of 1 / 2", "FEC enabled with a bit rate of 1 / 3", and "FEC enabled with a bit rate of 1 / 4". For instance, '00' indicates "FEC disabled", '01' indicates "FEC enabled with a bit rate of 1 / 2", '10' indicates "FEC enabled with a bit rate of 1 / 3", and '11' indicates "FEC enabled with a bit rate of 1 / 4".

[0433] For example, the first joint encoded information contains 2 bits. These 2 bits are used to indicate four values: FEC disabled, FEC enabled at 1 / 3 bit rate, FEC enabled at 1 / 3 bit rate repeated twice, and FEC enabled at 1 / 3 bit rate repeated four times. For instance, '00' indicates "FEC disabled", '01' indicates "FEC enabled at 1 / 3 bit rate", '10' indicates "FEC enabled at 1 / 3 bit rate repeated twice", and '11' indicates "FEC enabled at 1 / 3 bit rate repeated four times".

[0434] For example, the first joint coding information may contain 3 bits, 4 bits, or 5 bits. Different values ​​in the first joint coding information indicate different combinations of information. Each combination of information includes at least one of the following: whether forward error correction (FEC) is enabled, the code rate, and the number of repetitions.

[0435] In some embodiments, the first joint coding information can be indicated by 2 bits (FEC disabled, FEC enabled with 1 / 3 block repeat once, FEC enabled with 1 / 3 block repeat twice, FEC enabled with 1 / 3 block repeat four times) or by 3 bits (FEC disabled, FEC enabled with 1 / 3 block repeat once, FEC enabled with 1 / 3 block repeat twice, FEC enabled with 1 / 3 block repeat four times, FEC enabled with 1 / 3 block repeat eight times, FEC enabled with 1 / 3 block repeat 16 times, FEC enabled with 1 / 3 block repeat 32 times).

[0436] In some embodiments, the first joint coding information can be used to indicate (FEC disabled, FEC enabled with a 1 / 2 block repeat once, FEC enabled with a 1 / 3 block repeat once, FEC enabled with a 1 / 3 block repeat twice) or (FEC enabled with a 3-bit first joint coding information) to indicate (FEC disabled, FEC enabled with a 1 / 2 block repeat once, FEC enabled with a 1 / 3 block repeat once, FEC enabled with a 1 / 3 block repeat twice, FEC enabled with a 1 / 3 block repeat four times, FEC enabled with a 1 / 3 block repeat eight times, FEC enabled with a 1 / 3 block repeat sixteen times).

[0437] In some embodiments, repeating a block once is equivalent to not repeating it at all.

[0438] For example, for uplink (D2R) transmission, the first communication node may include devices such as readers, base stations, and terminals. For example, for uplink (D2R) transmission, the second communication node may include IoT devices such as tags, electronic tags, terminals, and Ambient-IoT terminals. Terminals include tags, IoT terminals, ordinary terminals, and low-cost terminals. As shown in Figure 1, this embodiment includes: S110-S120.

[0439] S110, Receive the preamble sent by the second communication node; wherein the preamble includes a transmission start indication part.

[0440] In one example, the first communication node receives a preamble sent by the second communication node. The preamble is an m-sequence or a golay sequence, or an m-sequence or a golay sequence encoded by Mancherster.

[0441] S120, Data reception based on preamble.

[0442] In one example, the second communication node sends a preamble to the first communication node. The first communication node can know the start of uplink transmission based on the preamble and use the preamble sent by the second communication node to synchronize time / chip length in order to accurately receive the uplink data sent by the second communication node.

[0443] In one embodiment, applied to a first communication node, when the first communication node is a base station and the second communication node is a terminal, in addition to receiving the preamble sent by the second communication node, it also includes receiving a pilot signal sent by the second communication node. The receiving of the pilot signal sent by the second communication node includes receiving the pilot signal sent by the second communication node according to data type and / or indication signaling. The pilot signal includes: a mid-preamble and / or a stop-preamble.

[0444] In some embodiments, receiving the pilot signal sent by the second communication node according to the data type and / or indication signaling specifically includes at least one of the following: when the data type is Msg1 with 3-step access, the first communication node receives a preamble and an intermediate pilot, with the intermediate pilot located at the end of the data; when the data type is other data types, the first communication node receives a preamble and an intermediate pilot, with the intermediate pilot located within the data; when the data type is Msg1 with 3-step access, the first communication node receives only the preamble; when the data type is other data types, according to the indication signaling, the first communication node receives both the preamble and the intermediate pilot, or receives only the preamble, wherein the intermediate pilot is located within the data, and the number of intermediate pilots is determined according to the indication signaling; when the data type is Msg1 with 3-step access, the first communication node receives a preamble and an end code; when the data type is other data types, according to the indication signaling, the first communication node receives the preamble, the intermediate pilot, and the end code, or the first communication node receives both the preamble and the end code.

[0445] The other data types include Msg3, data transmissions other than Msg1 and Msg3, data transmissions other than the three-step access Msg1, the two-step access Msg1, and at least one of the segmented data. Different data types may correspond to different transport block sizes. Larger transport blocks have longer transmission times, and the channel changes over time, thus requiring more pilots (e.g., preamble, introductory, and end codes) for good channel estimation and detection performance. Smaller transport blocks have shorter transmission times and less channel change, thus requiring fewer pilots. Therefore, different pilot designs for different data types can ensure good data transmission performance for each data type.

[0446] In one embodiment, the power of the high level of the transmission start indication portion is the same as the power of the high level of the chip length indication portion; or, the power of the high level of the transmission start indication portion is the same as the power of the high level of the data portion; or, the power of the high level of the chip length indication portion is the same as the power of the high level of the data portion; or, the power of the high level of the transmission start indication portion, the high level of the chip length indication portion, and the high level of the data portion are all the same; or, the power of the high level of the end code, the high level of the chip length indication portion, and the high level of the data portion are all the same.

[0447] The solution in this application can effectively distinguish between the transmission start indication part and the data part, which is beneficial for the detection of the data part, reduces false detections or misdetections, and improves detection efficiency.

[0448] For example, the fact that the power of the high level in the transmission start indication section is the same as the power of the high level in the chip length indication section or the data section means that the power of the high level of one chip in the transmission start indication section is equal to the power of the high level of one chip in the chip length indication section or the data section.

[0449] For example, the fact that the power of the high level in the transmission start indication portion is the same as the power of the high level in the chip length indication portion or the data portion means that the average power of the high level in the transmission start indication portion is equal to the average power of the high level in the chip length indication portion or the data portion. In some embodiments, the average power of the high levels being the same means that the total power of the high levels is the same within the same time period.

[0450] For downlink transmission, the power of the high-level signals can be adjusted by a second communication node. For example, a single OFDM symbol in the SIP section includes two high-level signals, while a single OFDM symbol in the data section includes four high-level signals. If the maximum total power of the second communication node transmitting one OFDM symbol is A, then the maximum power of transmitting one high-level signal in the SIP section is A / 2, and the maximum power of transmitting one high-level signal in the data section is A / 4. The second communication node can transmit each high-level signal in the SIP section at a power not exceeding A / 2. When the second communication node transmits the SIP at a power of A / 4 and transmits the data at its maximum power, the average power of the high-level signals in the data section and the SIP section is the same. This consistent power is beneficial for data reception and detection.

[0451] For downlink, in some embodiments, the second communication node transmits the same total power for each OFDM symbol.

[0452] For downlink, in some embodiments, the average power of the high level in the transmission start indication portion is the same as the average power of the high level in the chip length indication portion or the data portion. For example, one OFDM symbol in the SIP portion includes two high levels (M=4), and one OFDM symbol in the data portion includes three high levels (M=6). The maximum total power of the second communication node transmitting one OFDM symbol is A. Therefore, the maximum power of transmitting one high level in the SIP portion is A / 2, and the maximum power of transmitting one high level in the data portion is A / 3. However, since the high levels of two chips in one OFDM symbol in the SIP portion occupy half an OFDM symbol, and the high levels of three chips in one OFDM symbol in the data portion also occupy half an OFDM symbol, the average power of the high levels when transmitting the SIP portion and the data portion is the same.

[0453] In one embodiment, FIG2 is a flowchart of another data transmission method provided by an embodiment of this application. This embodiment can be executed by a second communication node. Exemplarily, for downlink transmission, the second communication node may include devices such as card readers and reader-writers; wherein, the reader-writer may include: a base station or user equipment; wherein, the user equipment may include: a smartphone or other access standard (e.g., 4G, 5G, etc.) terminal device. As shown in FIG2, this embodiment includes: S210.

[0454] S210. A preamble is sent to the first communication node so that the first communication node can receive data based on the preamble; wherein the preamble includes a transmission start indication part.

[0455] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the number of high-level chips in the first sub-block is greater than or equal to the number of low-level chips, the number of high-level chips in the second sub-block is equal to the number of low-level chips in the first sub-block, and the number of low-level chips in the second sub-block is equal to the number of high-level chips in the first sub-block.

[0456] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains a greater number of high-level chips than the number of low-level chips, and the second sub-block contains a less than the number of low-level chips; or, the first sub-block contains an equal number of high-level chips than the number of low-level chips, and the second sub-block contains an equal number of low-level chips than the number of high-level chips in the first sub-block.

[0457] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains a number of high-level chips greater than or equal to the number of low-level chips, and the second sub-block contains a number of high-level chips less than or equal to the number of low-level chips. The lengths of the first sub-block and the second sub-block may be different.

[0458] In one embodiment, the first sub-block includes a high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

[0459] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains the same number of chips as the second sub-block.

[0460] In one embodiment, the chip length corresponding to the transmission start indication portion is different from the chip length corresponding to the data portion.

[0461] In one embodiment, the data transmission method applied to the second communication node further includes: sending a chip length indication portion to the first communication node. The chip length indication portion is included in a preamble. That is, the preamble includes a transmission start indication portion and a chip length indication portion. The second communication node sends the preamble containing the transmission start indication portion and the chip length indication portion to the first communication node, so that the first communication node receives data based on the preamble containing the transmission start indication portion and the chip length indication portion.

[0462] In some embodiments, the M value of the chip length indication portion is different from the M value of the transmission start indication portion.

[0463] In one embodiment, the data transmission method applied to the second communication node further includes: the pattern of the chip length indication portion is determined according to the first chip quantity; wherein the first chip quantity is the number of chips contained in one OFDM symbol of the data portion.

[0464] In one embodiment, the data transmission method applied to the second communication node further includes: when the first number of chips is less than a first threshold, the chip length indication portion includes a first number of chips; when the first number of chips is greater than or equal to the first threshold, the chip length indication portion includes a second number of chips. Wherein, the first threshold is a positive integer greater than or equal to 8 and less than 32. Wherein, the first number is an even number, and the second number is an odd number.

[0465] In one embodiment, the data transmission method applied to the second communication node further includes: when the first number of chips is a value in a first set, the chip length indication portion includes a first number of chips; when the first number of chips is a value in a second set, the chip length indication portion includes a second number of chips. Wherein, the first number is even and the second number is odd, or the first number is a first even number and the second number is a second even number.

[0466] For example, the first quantity is 4, and the second quantity is 3, 5, 7, 9, 11, or 13. For example, the first quantity is 4, and the second quantity is 6, 8, 12, 16, or 24. For example, the first quantity is 6, and the second quantity is 8, 12, 16, or 24. For example, the first quantity is 6, and the second quantity is 7, 9, 11, 13, 15, or 23.

[0467] In one example, the number of chips contained in one OFDM symbol of the data portion is one of the following: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}. {16, 24}, {2, 4, 16, 24}, {2, 4, 8, 24}, {2, 6, 12, 24}, {2, 6, 16, 24}, {2, 8, 24}, {2, 8, 16}, {2, 6, 16}, {1, 6, 16}, {1, 4, 16}, {2, 4, 8, 16}, {2, 6, 12, 16}, {2, 6, 8, 16}, {1, 4, 8, 16}, {1, 2, 4, 6, 8, 16}, {2, 4, 6, 16}.

[0468] In one embodiment, FIG2 is a flowchart of another data transmission method provided by an embodiment of this application. This embodiment can be executed by a second communication node. Exemplarily, for uplink transmission, the first communication node may include devices such as card readers and reader-writers; wherein, the reader-writer may include: a base station or user equipment; wherein, the user equipment may include: a smartphone or other access standard (e.g., 4G, 5G, etc.) terminal device. The second communication node may include a terminal, an Ambient IoT tag, a tag, etc. As shown in FIG2, this embodiment includes: S210.

[0469] S210. A preamble is sent to the first communication node so that the first communication node can receive data based on the preamble; wherein the preamble includes a transmission start indication part.

[0470] The first communication node receives uplink data based on the preamble.

[0471] When the first communication node is a base station and the second communication node is a terminal, the second communication node, in addition to sending the preamble, also sends a pilot. The sending of the pilot includes the second communication node sending the pilot according to the data type and / or indication signaling, and the pilot includes: a middle preamble and / or a stop preamble.

[0472] In one embodiment, sending the pilot signal according to the data type and / or indication signaling specifically includes at least one of the following: when the data type is Msg1 with 3-step access, the second communication node sends a preamble and an intermediate code, with the intermediate code located at the end of the data; when the data type is other data types, the second communication node sends a preamble and an intermediate code, with the intermediate code located within the data; when the data type is Msg1 with 3-step access, the second communication node sends only a preamble; when the data type is other data types, according to the indication signaling, the second communication node sends both a preamble and an intermediate code, or the second communication node sends only a preamble, wherein the intermediate code is located within the data, and the number of intermediate codes is determined according to the indication signaling; when the data type is Msg1 with 3-step access, the second communication node sends a preamble and an end code; when the data type is other data types, according to the indication signaling, the second communication node sends a preamble, an intermediate code, and an end code, or the second communication node sends both a preamble and an end code.

[0473] The second communication node assumes that the power of the high level of the transmission start indication portion is the same as the power of the high level of the chip length indication portion, or the second communication node assumes that the power of the high level of the transmission start indication portion is the same as the power of the high level of the data portion, or the second communication node assumes that the power of the high level of the chip length indication portion is the same as the power of the high level of the data portion, or the second communication node assumes that the power of the high level of the transmission start indication portion, the high level of the chip length indication portion, and the high level of the data portion are the same, or the second communication node assumes that the power of the high level of the end code, the high level of the chip length indication portion, and the high level of the data portion are the same.

[0474] The explanation and determination process of parameters such as the transmission start indication part, chip length indication part, first sub-block, second sub-block, pattern, and number of first chips in the data transmission method applied to the second communication node can be found in the description of the corresponding parameters in the data transmission method applied to the first communication node, and will not be repeated here.

[0475] In one embodiment, FIG3 is a structural block diagram of a data transmission device provided in this application. This embodiment is applied to a first communication node. As shown in FIG3, the data transmission device in this embodiment includes a receiving module 310 and a transmitting module 320. The receiving module 310 is configured to receive a preamble sent by a second communication node; wherein the preamble includes a transmission start indication portion. The transmitting module 320 is configured to receive data based on the preamble.

[0476] For the receiving module 310 and the transmitting module 320, for downlink transmission, the first communication node includes IoT devices such as tags, electronic tags, terminals, Ambient-IoT terminals, ordinary terminals, and low-cost terminals, and the second communication node includes devices such as readers, base stations, and terminals.

[0477] For the receiving module 310 and the transmitting module 320, for uplink transmission, the first communication node includes devices such as readers, base stations, and terminals, and the second communication node includes IoT devices such as tags, electronic tags, terminals, Ambient-IoT terminals, ordinary terminals, and low-cost terminals.

[0478] In one embodiment, the transmission start indication portion includes one or more high levels and one or more low levels, and the number of high-level chips included in the transmission start indication portion is the same as the number of low-level chips.

[0479] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the number of high-level chips in the first sub-block is greater than or equal to the number of low-level chips, the number of high-level chips in the second sub-block is equal to the number of low-level chips in the first sub-block, and the number of low-level chips in the second sub-block is equal to the number of high-level chips in the first sub-block.

[0480] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains a greater number of high-level chips than the number of low-level chips, and the second sub-block contains a less than the number of low-level chips; or, the first sub-block contains an equal number of high-level chips than the number of low-level chips, and the second sub-block contains an equal number of low-level chips than the number of high-level chips in the first sub-block.

[0481] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains a number of high-level chips greater than or equal to the number of low-level chips, and the second sub-block contains a number of high-level chips less than or equal to the number of low-level chips. The lengths of the first sub-block and the second sub-block may be different.

[0482] In one embodiment, the first sub-block includes a high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

[0483] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains the same number of chips as the second sub-block.

[0484] In one embodiment, the chip length corresponding to the transmission start indication portion is different from the chip length corresponding to the data portion.

[0485] In one embodiment, the preamble includes a transmission start indication portion and a chip length indication portion.

[0486] In one embodiment, the high-low level sequence corresponding to the transmission start indication portion specifically includes one of the following: high level and low level; high level, low level and high level; low level, high level and low level; high level, low level, high level and low level.

[0487] In one embodiment, when the high-low level sequence corresponding to the transmission start indication portion is high level and low level, the ratio of the high level and low level specifically includes: 1:1, or 1:2, or 1:3, or 2:1, or 3:1, wherein the ratio of the high level and low level includes the duration ratio of the high level and low level, or the chip number ratio corresponding to the high level and low level.

[0488] In one embodiment, the high-low level sequence corresponding to the transmission start indication portion is high level, low level, and high level; or, when the high-low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, the ratio of the high level to the low level specifically includes: 1:1:1, or 1:2:1, or 1:1:2, or 2:1:1, or 1:4:1, or 1:1:4, or 4:1:1, or 3:2:1, or 1:2:3, or 1:3:2, or 3:1:2, or 2:3:1, or 2:1:3, or 2:1:2, or 2:2:1, or... 1:3:1, or 1:1:3, or 1:1:6, or 3:2:3, or 4:1:3, or 4:3:1, or 3:1:4, or 3:4:1, or 1:3:4, or 1:4:3, or 2:3:3, or 3:3:2, or 1:1:10, or 5:2:5, or 2:7:3, or 3:7:2, or 3:5:4, or 4:5:3, or 1:9:2, or 2:9:1; wherein, the ratio of high level to low level includes the ratio of the duration of high level to low level, or the ratio of the number of chips corresponding to high level and low level.

[0489] In one embodiment, when the high-low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, the ratio of the high level to the low level specifically includes: a repetition of a preset high-level to low level ratio, or a combination of any two preset high-level to low level ratios. Specifically, the preset high-level to low level ratio includes: 1:1, 1:2, 1:3, 2:1, and 3:1. The ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the ratio of the number of chips corresponding to the high level and the low level.

[0490] In one embodiment, the total length of the high and low corresponding to the transmission start indication portion is half the OFDM symbol duration, or one OFDM symbol duration, or two OFDM symbol duration, or three OFDM symbol duration.

[0491] In one embodiment, the relationship between the chip length corresponding to the transmission start indication portion and the OFDM symbol length includes: M chip lengths corresponding to the transmission start indication portion correspond to one OFDM symbol length, wherein the value of M is 4, or 6, or 8, or 12, or 24, or 10.

[0492] In some embodiments, the M value of the chip length indication portion is different from the M value of the transmission start indication portion.

[0493] In one embodiment, the pattern of the chip length indication portion is determined based on a first chip quantity; wherein the first chip quantity is the number of chips contained in one OFDM symbol of the data portion.

[0494] In one embodiment, when the first number of chips is less than a first threshold, the chip length indication portion includes a first number of chips; when the first number of chips is greater than or equal to the first threshold, the chip length indication portion includes a second number of chips. The first threshold is a positive integer greater than or equal to 8 and less than 32. The first number is an even number, and the second number is an odd number.

[0495] In one embodiment, when the first number of chips is a value in a first set, the chip length indication portion includes a first number of chips; when the first number of chips is a value in a second set, the chip length indication portion includes a second number of chips. Wherein, the first number is even and the second number is odd, or the first number is a first even number and the second number is a second even number.

[0496] For example, the first quantity is 4, and the second quantity is 3, 5, 7, 9, 11, or 13. For example, the first quantity is 4, and the second quantity is 6, 8, 12, 16, or 24. For example, the first quantity is 6, and the second quantity is 8, 12, 16, or 24. For example, the first quantity is 6, and the second quantity is 7, 9, 11, 13, 15, or 23.

[0497] In one example, the number of chips contained in one OFDM symbol of the data portion is one of the following: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}. {16, 24}, {2, 4, 16, 24}, {2, 4, 8, 24}, {2, 6, 12, 24}, {2, 6, 16, 24}, {2, 8, 24}, {2, 8, 16}, {2, 6, 16}, {1, 6, 16}, {1, 4, 16}, {2, 4, 8, 16}, {2, 6, 12, 16}, {2, 6, 8, 16}, {1, 4, 8, 16}, {1, 2, 4, 6, 8, 16}, {2, 4, 6, 16}.

[0498] In one embodiment, the method applied to the first communication node further includes receiving control information sent by the second communication node; the control information includes an information type, and the first communication node determines at least one of the following based on the information type: transport block size, presence of CRC, CRC length, presence of an end-of-data code after the data portion, or presence of an end-of-data code after the data portion. The transport block size is the transport block size for downlink data transmission.

[0499] In one embodiment, when the information type is a first type, the first communication node determines the transport block size according to the information type; when the information type is a second type, the first communication node determines that there is an end code after the data portion according to the information type.

[0500] In some embodiments, when the information type is a first type, the first communication node determines that the downlink transmission does not have a CRC based on the information type; when the information type is a second type, the first communication node determines that the downlink transmission has a CRC based on the information type.

[0501] In one embodiment, applied to a first communication node, when the first communication node is a base station and the second communication node is a terminal, in addition to receiving the preamble sent by the second communication node, it also includes receiving a pilot signal sent by the second communication node. The receiving of the pilot signal sent by the second communication node includes receiving the pilot signal sent by the second communication node according to data type and / or indication signaling. The pilot signal includes: a mid-preamble and / or a stop-preamble.

[0502] In some embodiments, receiving the pilot signal sent by the second communication node according to the data type and / or indication signaling specifically includes at least one of the following:

[0503] When the data type is Msg1 (accessed via 3 steps), the first communication node receives the preamble and the intermediate code, with the intermediate code located at the end of the data. When the data type is other data types, the first communication node receives the preamble and the intermediate code, with the intermediate code located within the data. When the data type is Msg1 (accessed via 3 steps), the first communication node only receives the preamble. When the data type is other data types, according to the instruction signaling, the first communication node receives the preamble and the intermediate code, or only receives the preamble, wherein the intermediate code is located within the data, and the number of intermediate codes is determined according to the instruction signaling. When the data type is Msg1 (accessed via 3 steps), the first communication node receives the preamble and the end code. When the data type is other data types, according to the instruction signaling, the first communication node receives the preamble, the intermediate code, and the end code, or the first communication node receives both the preamble and the end code.

[0504] The power of the high level of the transmission start indication portion is the same as the power of the high level of the chip length indication portion, or the power of the high level of the transmission start indication portion is the same as the power of the high level of the data portion, or the power of the high level of the chip length indication portion is the same as the power of the high level of the data portion, or the power of the high level of the transmission start indication portion, the high level of the chip length indication portion, and the high level of the data portion are the same, or the power of the high level of the end code, the high level of the chip length indication portion, and the high level of the data portion are the same.

[0505] In one embodiment, the data transmission apparatus applied to the first communication node further includes: a determining module configured to determine the range of M values ​​for the data portion based on a pattern of chip length indication information.

[0506] In one embodiment, when the first number of chips is less than a first threshold, the chip length indication portion includes a first number of chips; when the first number of chips is greater than or equal to the first threshold, the chip length indication portion includes a second number of chips. The first threshold is a positive integer greater than or equal to 8 and less than 32. The first number is an even number, and the second number is an odd number.

[0507] In one embodiment, when the first number of chips is a value in a first set, the chip length indication portion includes a first number of chips; when the first number of chips is a value in a second set, the chip length indication portion includes a second number of chips. Wherein, the first number is even and the second number is odd, or the first number is a first even number and the second number is a second even number.

[0508] The pattern in the chip length indicator section represents the number of chips and / or the sequence of chips in the chip length indicator section. Different patterns represent different numbers of chips and / or sequences.

[0509] The data transmission device provided in this embodiment is configured to implement the data transmission method applied to the first communication node in the embodiment shown in FIG1. ​​The implementation principle and technical effect of the data transmission device provided in this embodiment are similar, and will not be described again here.

[0510] In one embodiment, FIG4 is a structural block diagram of another data transmission device provided in this application embodiment. This embodiment is applied to a second communication node. As shown in FIG4, the data transmission device in this embodiment includes: a sending module 410.

[0511] The sending module 410 is configured to send a preamble to the first communication node so that the first communication node can receive data based on the preamble, wherein the preamble includes a start indication part.

[0512] For the transmitting module 410, for downlink transmission, the first communication node includes IoT devices such as tags, electronic tags, terminals, and Ambient-IoT terminals, and the second communication node includes devices such as readers, base stations, and terminals.

[0513] For the sending module 410, for uplink transmission, the first communication node includes devices such as readers, base stations, and terminals, and the second communication node includes IoT devices such as tags, electronic tags, terminals, and Ambient-IoT terminals.

[0514] In one embodiment, the transmission start indication portion includes one or more high levels and one or more low levels, and the number of high-level chips included in the transmission start indication portion is the same as the number of low-level chips.

[0515] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the number of high-level chips in the first sub-block is greater than or equal to the number of low-level chips, the number of high-level chips in the second sub-block is equal to the number of low-level chips in the first sub-block, and the number of low-level chips in the second sub-block is equal to the number of high-level chips in the first sub-block.

[0516] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains a greater number of high-level chips than the number of low-level chips, and the second sub-block contains a less than the number of low-level chips; or, the first sub-block contains an equal number of high-level chips than the number of low-level chips, and the second sub-block contains an equal number of low-level chips than the number of high-level chips in the first sub-block.

[0517] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains a number of high-level chips greater than or equal to the number of low-level chips, and the second sub-block contains a number of high-level chips less than or equal to the number of low-level chips. The lengths of the first sub-block and the second sub-block may be different.

[0518] In one embodiment, the first sub-block includes a high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

[0519] In one embodiment, the transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains the same number of chips as the second sub-block.

[0520] In one embodiment, the chip length corresponding to the transmission start indication portion is different from the chip length corresponding to the data portion.

[0521] In one embodiment, the high-low level sequence corresponding to the transmission start indication portion specifically includes one of the following: high level and low level; high level, low level and high level; low level, high level and low level; high level, low level, high level and low level.

[0522] In one embodiment, when the high-low level sequence corresponding to the transmission start indication portion is high level and low level, the ratio of the high level and low level specifically includes: 1:1, or 1:2, or 1:3, or 2:1, or 3:1, wherein the ratio of the high level and low level includes the duration ratio of the high level and low level, or the chip number ratio corresponding to the high level and low level.

[0523] In one embodiment, the high-low level sequence corresponding to the transmission start indication portion is high level, low level, and high level; or, when the high-low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, the ratio of the high level to the low level specifically includes: 1:1:1, or 1:2:1, or 1:1:2, or 2:1:1, or 1:4:1, or 1:1:4, or 4:1:1, or 3:2:1, or 1:2:3, or 1:3:2, or 3:1:2, or 2:3:1, or 2:1:3, or 2:1:2, or 2:2:1, or... 1:3:1, or 1:1:3, or 1:1:6, or 3:2:3, or 4:1:3, or 4:3:1, or 3:1:4, or 3:4:1, or 1:3:4, or 1:4:3, or 2:3:3, or 3:3:2, or 1:1:10, or 5:2:5, or 2:7:3, or 3:7:2, or 3:5:4, or 4:5:3, or 1:9:2, or 2:9:1; wherein, the ratio of high level to low level includes the ratio of the duration of high level to low level, or the ratio of the number of chips corresponding to high level and low level.

[0524] In one embodiment, when the high-low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, the ratio of the high level to the low level specifically includes: a repetition of a preset high-level to low level ratio, or a combination of any two preset high-level to low level ratios. Specifically, the preset high-level to low level ratio includes: 1:1, 1:2, 1:3, 2:1, and 3:1. The ratio of the high level to the low level includes the duration ratio of the high level to the low level, or the ratio of the number of chips corresponding to the high level and the low level.

[0525] In one embodiment, the total length of the high and low corresponding to the transmission start indication portion is half the OFDM symbol duration, or one OFDM symbol duration, or two OFDM symbol duration, or three OFDM symbol duration.

[0526] In one embodiment, the relationship between the chip length corresponding to the transmission start indication portion and the OFDM symbol length includes: M chip lengths corresponding to the transmission start indication portion correspond to one OFDM symbol length, wherein the value of M is 4, or 6, or 8, or 12, or 24, or 10.

[0527] In one embodiment, the preamble includes a transmission start indication portion and a chip length indication portion.

[0528] In some embodiments, the M value of the chip length indication portion is different from the M value of the transmission start indication portion.

[0529] In one embodiment, the pattern of the chip length indication portion is determined based on a first chip quantity; wherein the first chip quantity is the number of chips contained in one OFDM symbol of the data portion.

[0530] In one embodiment, when the first number of chips is less than a first threshold, the chip length indication portion includes a first number of chips; when the first number of chips is greater than or equal to the first threshold, the chip length indication portion includes a second number of chips. The first threshold is a positive integer greater than or equal to 8 and less than 32. The first number is an even number, and the second number is an odd number.

[0531] In one embodiment, when the first number of chips is a value in a first set, the chip length indication portion includes a first number of chips; when the first number of chips is a value in a second set, the chip length indication portion includes a second number of chips. Wherein, the first number is even and the second number is odd, or the first number is a first even number and the second number is a second even number.

[0532] For example, the first quantity is 4, and the second quantity is 3, 5, 7, 9, 11, or 13. For example, the first quantity is 4, and the second quantity is 6, 8, 12, or 24. For example, the first quantity is 6, and the second quantity is 8, 12, or 24. For example, the first quantity is 6, and the second quantity is 7, 9, 11, 13, 15, or 23.

[0533] In one example, the number of chips contained in one OFDM symbol of the data portion is one of the following: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}, {1, 4, 8, 24}. {16, 24}, {2, 4, 16, 24}, {2, 4, 8, 24}, {2, 6, 12, 24}, {2, 6, 16, 24}, {2, 8, 24}, {2, 8, 16}, {2, 6, 16}, {1, 6, 16}, {1, 4, 16}, {2, 4, 8, 16}, {2, 6, 12, 16}, {2, 6, 8, 16}, {1, 4, 8, 16}, {1, 2, 4, 6, 8, 16}, {2, 4, 6, 16}.

[0534] When the first communication node is a base station and the second communication node is a terminal, the second communication node, in addition to sending the preamble, also sends a pilot. The sending of the pilot includes the second communication node sending the pilot according to the data type and / or indication signaling, and the pilot includes: a middle preamble and / or a stop preamble.

[0535] In one embodiment, sending the pilot signal according to the data type and / or indication signaling specifically includes at least one of the following: when the data type is Msg1 with 3-step access, the second communication node sends a preamble and an intermediate code, with the intermediate code located at the end of the data; when the data type is other data types, the second communication node sends a preamble and an intermediate code, with the intermediate code located within the data; when the data type is Msg1 with 3-step access, the second communication node sends only a preamble; when the data type is other data types, according to the indication signaling, the second communication node sends both a preamble and an intermediate code, or the second communication node sends only a preamble, wherein the intermediate code is located within the data, and the number of intermediate codes is determined according to the indication signaling; when the data type is Msg1 with 3-step access, the second communication node sends a preamble and an end code; when the data type is other data types, according to the indication signaling, the second communication node sends a preamble, an intermediate code, and an end code, or the second communication node sends both a preamble and an end code.

[0536] The second communication node assumes that the power of the high level of the transmission start indication portion is the same as the power of the high level of the chip length indication portion, or the second communication node assumes that the power of the high level of the transmission start indication portion is the same as the power of the high level of the data portion, or the second communication node assumes that the power of the high level of the chip length indication portion is the same as the power of the high level of the data portion, or the second communication node assumes that the power of the high level of the transmission start indication portion, the high level of the chip length indication portion, and the high level of the data portion are the same, or the second communication node assumes that the power of the high level of the end code, the high level of the chip length indication portion, and the high level of the data portion are the same.

[0537] In one embodiment, the data transmission device applied to the second communication node further includes:

[0538] The module is configured to determine the pattern of the chip length indication information based on the M value of the data section.

[0539] In one embodiment, when the first number of chips is less than a first threshold, the chip length indication portion includes a first number of chips; when the first number of chips is greater than or equal to the first threshold, the chip length indication portion includes a second number of chips. The first threshold is a positive integer greater than or equal to 8 and less than 32. The first number is an even number, and the second number is an odd number.

[0540] In one embodiment, when the first number of chips is a value in a first set, the chip length indication portion includes a first number of chips; when the first number of chips is a value in a second set, the chip length indication portion includes a second number of chips. Wherein, the first number is even and the second number is odd, or the first number is a first even number and the second number is a second even number.

[0541] The pattern in the chip length indicator section represents the number of chips and / or the sequence of chips in the chip length indicator section. Different patterns represent different numbers of chips and / or sequences.

[0542] In the above embodiments, if the preamble only includes a transmission start indication portion, then the transmission start indication portion is the preamble.

[0543] The data transmission device provided in this embodiment is configured to implement the data transmission method applied to the second communication node in the embodiment shown in Figure 2. The implementation principle and technical effect of the data transmission device provided in this embodiment are similar, and will not be described again here.

[0544] In one embodiment, FIG5 is a schematic diagram of the structure of a communication device provided in this application. As shown in FIG5, the device provided in this application includes: a processor 510, a memory 520, and a communication module 530. The number of processors 510 in the device can be one or more; FIG5 shows one processor 510 as an example. The number of memories 520 in the device can be one or more; FIG5 shows one memory 520 as an example. The processor 510, memory 520, and communication module 530 of the device can be connected via a bus or other means; FIG5 shows a connection via a bus as an example. In this embodiment, the device can be a first communication node or a second communication node.

[0545] The memory 520, as a computer-readable storage medium, can be configured to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the device in any embodiment of this application (e.g., receiving module 310 and transmitting module 320 applied in a data transmission device for a first communication node, or transmitting module 410 applied in a data transmission device for a second communication node). The memory 520 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application program required for at least one function; the data storage area may store data created according to the use of the device, etc. Furthermore, the memory 520 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 520 may further include memory remotely located relative to the processor 510, and these remote memories can be connected to the device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0546] When the communication device is the first communication node, the device provided above can be configured to execute the data transmission method applied to the first communication node provided in any of the above embodiments, and has the corresponding functions and effects.

[0547] When the communication device is a second communication node, the device provided above can be configured to execute the data transmission method for the second communication node provided in any of the above embodiments, and has the corresponding functions and effects.

[0548] This application also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform a data transmission method applied to a first communication node. The method includes: receiving a preamble sent by a second communication node; wherein the preamble includes a transmission start indication portion; and receiving data based on the preamble.

[0549] This application also provides a storage medium containing computer-executable instructions. When executed by a computer processor, the computer-executable instructions are used to perform a data transmission method applied to a second communication node. The method includes: sending a preamble to a first communication node to enable the first communication node to receive data via the preamble; wherein the preamble includes a transmission start indication portion.

[0550] Those skilled in the art will understand that the term user equipment covers any suitable type of wireless user equipment, such as mobile phones, portable data processing devices, portable web browsers, or vehicle-mounted mobile stations.

[0551] Generally, the various embodiments of this application can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although this application is not limited thereto.

[0552] Embodiments of this application can be implemented by executing computer program instructions through the data processor of a mobile device, for example, in a processor entity, or through hardware, or through a combination of software and hardware. The computer program instructions can be assembly instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages.

[0553] Any block diagram of logical flow in the accompanying drawings of this application may represent program operations, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program operations and logic circuits, modules, and functions. The computer program may be stored on memory. The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical storage devices and systems (Digital Video Disc (DVD) or Compact Disk (CD)), etc. Computer-readable media may include non-transitory storage media. The data processor may be of any type suitable to the local technical environment, such as, but not limited to, general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and processors based on multi-core processor architectures.

[0554] This application also provides a computer program product, including a computer program that, when executed by a processor, can implement the data transmission method provided in any embodiment of this application.

[0555] In the implementation of the computer program product, computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

Claims

1. A data transmission method, applied to a first communication node, comprising: Receive a preamble sent by a second communication node; wherein the preamble includes a transmission start indication portion; Data reception is performed based on the preamble.

2. The method according to claim 1, wherein, The transmission start indication portion includes at least one high level and at least one low level, and the number of high-level chips included in the transmission start indication portion is the same as the number of low-level chips.

3. The method according to claim 2, wherein, The transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains a greater number of high-level chips than the number of low-level chips, and the second sub-block contains a less than the number of low-level chips; or, the first sub-block contains an equal number of high-level chips than the number of low-level chips, and the second sub-block contains an equal number of low-level chips than the number of high-level chips in the first sub-block.

4. The method according to claim 1 or 3, wherein, The transmission start indication portion includes a first sub-block and a second sub-block, wherein the number of chips contained in the first sub-block is the same as the number of chips contained in the second sub-block; or, the first sub-block includes a high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

5. The method according to claim 1, wherein, The chip length corresponding to the transmission start indication portion is different from the chip length corresponding to the data portion.

6. The method according to claim 1, wherein, The high / low level sequence corresponding to the transmission start indication section includes one of the following: High level and low level; High level, low level, and high level; Low level, high level, and low level; High level, low level, high level and low level.

7. The method according to claim 6, wherein, When the high and low level sequence corresponding to the transmission start indication portion is high level and low level, the ratio of the high level and low level specifically includes: 1:1, or 1:2, or 1:3, or 2:1, or 3:1, wherein the ratio of the high level and low level includes the duration ratio of the high level and low level, or the chip number ratio corresponding to the high level and low level.

8. The method according to claim 6, wherein, When the high-low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, or when the high-low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, the ratio of the high and low levels corresponding to the transmission start indication portion includes: 1:1:1, or 1:2:1, or 1:1:2, or 2:1:1, or 1:4:1, or 1:1:4, or 4:1:1, or 3:2:1, or 1:2:3, or 1:3:2, or 3:1:2, or 2:3:1, or 2:1:3, or 2:1:2 Or, 2:2:1, or, 1:3:1, or, 1:1:3, or, 1:1:6, or, 3:2:3, or, 4:1:3, or, 4:3:1, or, 3:1:4, or, 3:4:1, or, 1:3:4, or, 1:4:3, or, 2:3:3, or, 3:3:2, or, 1:1:10, or, 5:2:5, or, 2:7:3, or, 3:7:2, or, 3:5:4, or, 4:5:3, or, 1:9:2, or, 2:9:1; wherein, the ratio of high and low levels includes the ratio of the duration of the high and low levels, or the ratio of the number of chips corresponding to the high and low levels.

9. The method according to claim 6, wherein, When the high-low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, the ratio of the high-low level corresponding to the transmission start indication portion includes: a repetition of a preset high-level and low-level ratio, or a combination of two ratios among the preset high-level and low-level ratios, wherein the preset high-level and low-level ratio includes: 1:1, 1:2, 1:3, 2:1, 3:1; the ratio of the high-low level includes the duration ratio of the high-low level, or the ratio of the number of chips corresponding to the high-low level.

10. The method according to claim 6, 7, 8, or 9, wherein, The total length of the high and low levels corresponding to the transmission start indication section is half the duration of an orthogonal frequency division multiplexing (OFDM) symbol, or one OFDM symbol duration, or two OFDM symbol durations, or three OFDM symbol durations.

11. The method according to claim 6, 7, 8, or 9, wherein, The relationship between the chip length corresponding to the transmission start indication portion and the length of an OFDM symbol includes: M chip lengths corresponding to the transmission start indication portions correspond to one OFDM symbol length, where M is 4, 6, 8, 12, 24, or 10.

12. The method according to claim 1, wherein, The preamble also includes a chip length indication portion.

13. The method according to claim 12, wherein, The pattern of the chip length indication portion is determined based on the first chip quantity; wherein, the first chip quantity is the number of chips contained in one OFDM symbol of the data portion.

14. The method according to claim 13, wherein, When the first number of chips is a value in the first set, the chip length indication portion contains the first number of chips; When the first number of chips is a value in the second set, the chip length indication portion contains the second number of chips; Wherein, the first quantity is even and the second quantity is odd, or the first quantity is a first even number and the second quantity is a second even number.

15. The method according to claim 14, wherein, The first quantity and the second quantity include at least one combination of the following: The first quantity is 4, and the second quantity is 3, 5, 7, 9, 11, or 13; The first quantity is 4, and the second quantity is 6, 8, 12, 16, or 24. The first quantity is 6, and the second quantity is 8, 12, 16, or 24; The first quantity is 6, and the second quantity is 7, 9, 11, 13, 15, or 23.

16. The method according to claim 1, wherein, One OFDM symbol in the data portion contains one of the following number of chips: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 16, 24}. 24},{2,4,16,24},{2,4,8,24},{2,6,12,24},{2,6,16,24},{2,8,24},{2,8,16},{2,6,16},{1,6,16},{1,4,16},{2,4,8,16},{2,6,12,16},{2,6,8,16},{1,4,8,16},{1,2,4,6,8,16},{2,4,6,8,16},{2,4,6,16}。 17. The method according to claim 1, wherein, When the preamble is a downlink preamble, the first communication node is a terminal and the second communication node is a base station; or, when the preamble is an uplink preamble, the first communication node is a base station and the second communication node is a terminal.

18. The method according to claim 1, wherein, When the first communication node is a base station and the second communication node is a terminal, the method further includes: receiving pilot signals sent by the second communication node; Receiving the pilot signal sent by the second communication node includes: receiving the pilot signal sent by the second communication node according to at least one of the data type and the indication signaling; the pilot signal includes at least one of the intro code and the end code.

19. The method according to claim 18, wherein, The method of receiving the pilot signal sent by the second communication node includes at least one of the following: When the data type is Msg1 (3-step access), the first communication node receives the preamble and the intermembrane, with the intermembrane located at the end of the data; when the data type is other, the first communication node receives the preamble and the intermembrane, with the intermembrane located within the data. In the case of Msg1, where the data type is 3-step access, the first communication node only receives the preamble; If the data type is other than the specified data type, the first communication node receives the preamble and the intermediate code according to the instruction signaling, or receives only the preamble, wherein the intermediate code is located in the data, and the number of intermediate codes is determined according to the instruction signaling. When the data type is Msg1 (3-step access), the first communication node receives the preamble and the end code; when the data type is other data type, according to the indication signaling, the first communication node receives the preamble, the intermediate code, and the end code, or the first communication node receives the preamble and the end code.

20. The method according to claim 1, wherein, The power of the high level of the transmission start indication portion is the same as the power of the high level of the chip length indication portion, or the power of the high level of the transmission start indication portion is the same as the power of the high level of the data portion, or the power of the high level of the chip length indication portion is the same as the power of the high level of the data portion, or the power of the high level of the transmission start indication portion, the high level of the chip length indication portion, and the high level of the data portion are the same, or the power of the high level of the end code, the high level of the chip length indication portion, and the high level of the data portion are the same.

21. A data transmission method, applied to a second communication node, comprising: Send a preamble to the first communication node so that the first communication node can receive data based on the preamble; The preamble includes a transmission start indication portion.

22. The method according to claim 21, wherein, The transmission start indication portion includes at least one high level and at least one low level, and the number of high-level chips included in the transmission start indication portion is the same as the number of low-level chips.

23. The method according to claim 22, wherein, The transmission start indication portion includes a first sub-block and a second sub-block, wherein the first sub-block contains a greater number of high-level chips than the number of low-level chips, and the second sub-block contains a less than the number of low-level chips; or, the first sub-block contains an equal number of high-level chips than the number of low-level chips, and the second sub-block contains an equal number of low-level chips than the number of high-level chips in the first sub-block.

24. The method according to claim 21 or 23, wherein, The transmission start indication portion includes a first sub-block and a second sub-block, wherein the number of chips contained in the first sub-block is the same as the number of chips contained in the second sub-block; or, the first sub-block includes a high-low level transition, and the second sub-block includes one, two, or three high-low level transitions.

25. The method according to claim 21, wherein, The chip length corresponding to the transmission start indication portion is different from the chip length corresponding to the data portion.

26. The method according to claim 21, wherein, The high / low level sequence corresponding to the transmission start indication section includes one of the following: High level and low level; High level, low level, and high level; Low level, high level, and low level; High level, low level, high level and low level.

27. The method according to claim 26, wherein, When the high-low level sequence corresponding to the transmission start indication portion is high level and low level, the ratio of the high level and low level includes: 1:1, or 1:2, or 1:3, or 2:1, or 3:1, wherein the ratio of the high level and low level includes the duration ratio of the high level and low level, or the chip number ratio corresponding to the high level and low level.

28. The method according to claim 26, wherein, When the high-low level sequence corresponding to the transmission start indication portion is high level, low level, and high level, or when the high-low level sequence corresponding to the transmission start indication portion is low level, high level, and low level, the ratio of the high and low levels corresponding to the transmission start indication portion includes: 1:1:1, or 1:2:1, or 1:1:2, or 2:1:1, or 1:4:1, or 1:1:4, or 4:1:1, or 3:2:1, or 1:2:3, or 1:3:2, or 3:1:2, or 2:3:1, or 2:1:3, or 2:1:2 Or, 2:2:1, or, 1:3:1, or, 1:1:3, or, 1:1:6, or, 3:2:3, or, 4:1:3, or, 4:3:1, or, 3:1:4, or, 3:4:1, or, 1:3:4, or, 1:4:3, or, 2:3:3, or, 3:3:2, or, 1:1:10, or, 5:2:5, or, 2:7:3, or, 3:7:2, or, 3:5:4, or, 4:5:3, or, 1:9:2, or, 2:9:1; wherein, the ratio of high and low levels includes the ratio of the duration of the high and low levels, or the ratio of the number of chips corresponding to the high and low levels.

29. The method according to claim 26, wherein, When the high-low level sequence corresponding to the transmission start indication portion is high level, low level, high level, and low level, the ratio of the high-low level corresponding to the transmission start indication portion includes: a repetition of a preset high-level and low-level ratio, or a combination of two ratios among the preset high-level and low-level ratios, wherein the preset high-level and low-level ratio includes: 1:1, 1:2, 1:3, 2:1, 3:1; the ratio of the high-low level includes the duration ratio of the high-low level, or the ratio of the number of chips corresponding to the high-low level.

30. The method according to claim 26, 27, 28, or 29, wherein, The total length of the high and low levels corresponding to the transmission start indication section is half the duration of an orthogonal frequency division multiplexing (OFDM) symbol, or one OFDM symbol duration, or two OFDM symbol durations, or three OFDM symbol durations.

31. The method according to claim 26, 27, 28, or 29, wherein, The relationship between the chip length corresponding to the transmission start indication portion and the length of an OFDM symbol includes: M chip lengths corresponding to the transmission start indication portions correspond to one OFDM symbol length, where M is 4, 6, 8, 12, 24, or 10.

32. The method according to claim 21, wherein, The preamble also includes a chip length indication portion.

33. The method according to claim 32, wherein, The pattern of the chip length indication portion is determined based on the first chip quantity; wherein, the first chip quantity is the number of chips contained in one OFDM symbol of the data portion.

34. The method according to claim 33, wherein, When the first number of chips is a value in the first set, the chip length indication portion contains the first number of chips; When the first number of chips is a value in the second set, the chip length indication portion contains the second number of chips; Wherein, the first quantity is even and the second quantity is odd, or the first quantity is a first even number and the second quantity is a second even number.

35. The method according to claim 34, wherein, The first quantity and the second quantity include at least one combination of the following: The first quantity is 4, and the second quantity is 3, 5, 7, 9, 11, or 13; The first quantity is 4, and the second quantity is 6, 8, 12, 16, or 24. The first quantity is 6, and the second quantity is 8, 12, 16, or 24; The first quantity is 6, and the second quantity is 7, 9, 11, 13, 15, or 23.

36. The method according to claim 21, wherein, One OFDM symbol in the data portion contains one of the following number of chips: {2, 4, 6, 12, 24}, {2, 6, 12, 24}, {1, 2, 6, 12, 24}, {1, 2, 4, 8, 24}, {1, 2, 4, 12, 24}, {1, 2, 4, 6, 12, 24}, {2, 4, 8, 16, 24}, {1, 2, 4, 24}, {2, 6, 24}, {2, 8, 24}, {2, 4, 24}, {1, 4, 8, 24}, {1, 4, 16, 24}. 24},{2,4,16,24},{2,4,8,24},{2,6,12,24},{2,6,16,24},{2,8,24},{2,8,16},{2,6,16},{1,6,16},{1,4,16},{2,4,8,16},{2,6,12,16},{2,6,8,16},{1,4,8,16},{1,2,4,6,8,16},{2,4,6,8,16},{2,4,6,16}。 37. The method according to claim 21, wherein, When the preamble is a downlink preamble, the first communication node is a terminal and the second communication node is a base station; or, when the preamble is an uplink preamble, the first communication node is a base station and the second communication node is a terminal.

38. The method according to claim 21, wherein, When the first communication node is a base station and the second communication node is a terminal, the method further includes: transmitting pilot signals; Sending the pilot signal includes: the second communication node sending the pilot signal according to at least one of data type and indication signaling; the pilot signal includes at least one of introductory code and end code.

39. The method according to claim 38, wherein, The method of transmitting the pilot signal includes at least one of the following: When the data type is Msg1 (accessed via 3 steps), the second communication node sends a preamble and an intermembrane, with the intermembrane located at the end of the data; when the data type is other data types, the second communication node sends a preamble and an intermembrane, with the intermembrane located within the data. In the case of Msg1, where the data type is 3-step access, the second communication node only sends a preamble; If the data type is other than the specified data type, the second communication node sends the preamble and the intermembrane according to the instruction signaling, or the second communication node sends only the preamble, wherein the intermembrane is located in the data, and the number of intermembrane is determined according to the instruction signaling. When the data type is Msg1 (3-step access), the second communication node sends a preamble and an end code; when the data type is another data type, the second communication node sends a preamble, an intermediate code, and an end code according to the instruction signaling, or the second communication node sends a preamble and an end code.

40. The method according to claim 21, wherein, The power of the high level of the transmission start indication portion is the same as the power of the high level of the chip length indication portion, or the power of the high level of the transmission start indication portion is the same as the power of the high level of the data portion, or the power of the high level of the chip length indication portion is the same as the power of the high level of the data portion, or the power of the high level of the transmission start indication portion, the high level of the chip length indication portion, and the high level of the data portion are the same, or the power of the high level of the end code, the high level of the chip length indication portion, and the high level of the data portion are the same.

41. A data transmission apparatus, applied to a first communication node, comprising: The receiving module is configured to receive a preamble sent by the second communication node; wherein the preamble includes a transmission start indication portion; The transmission module is configured to receive data based on the preamble.

42. A data transmission apparatus, applied to a second communication node, comprising: The sending module is configured to send a preamble to a first communication node so that the first communication node can receive data based on the preamble. The preamble includes a transmission start indication portion.

43. A communication device, comprising: Memory, and at least one processor; The memory is configured to store at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the data transmission method as described in any one of claims 1-20 or 21-40.

44. A storage medium storing a computer program, which, when executed by a processor, implements the data transmission method as described in any one of claims 1-20 or 21-40.

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